Belgium names Brussels bomber brothers, key suspect on run

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Brussels Bombing Suspect Arrested: Report

BRUSSELS (Reuters) - Belgium's chief prosecutor named two brothers on Wednesday as Islamic State suicide bombers who killed at least 31 people in the most deadly attacks in Brussels' history but said another key suspect was on the run.

Tuesday's attacks on a city that is home to the European Union and NATO sent shockwaves across Europe and around the world, with authorities racing to review security at airports and on public transport. It also rekindled debate about lagging European security cooperation and flaws in police surveillance.

Brussels attacks suspects

Washington announced that Secretary of State John Kerry would visit Belgium on Friday to demonstrate support.

The Belgian federal prosecutor told a news conference that Ibrahim El Bakraoui, 29, one of two men who blew themselves up at Brussels airport on Tuesday, had left a will on a computer dumped in a rubbish bin near the militants' hideout.

READ MORE: Brussels Terror Attacks: Front pages from around the world

In it, he described himself as "always on the run, not knowing what to do anymore, being hunted everywhere, not being safe any longer and that if he hangs around, he risks ending up next to the person in a cell" - a reference to suspected Paris bomber Salah Abdeslam, who was arrested last week.

His brother Khalid El Bakraoui, 27, detonated a bomb an hour later on a crowded rush-hour metro train near the European Commission headquarters, prosecutor Frederic Van Leeuw said.

See photos from the scenes of the explosions in Brussels:

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Brussels Attacks: Explosions at airport, Maelbeek metro station
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Belgium names Brussels bomber brothers, key suspect on run
People are evacuated from Brussels Airport, in Zaventem, on March 22, 2016. after at least 13 people have been killed by two explosions in the departure hall of Brussels Airport. / AFP / Belga / VIRGINIE LEFOUR / Belgium OUT (Photo credit should read VIRGINIE LEFOUR/AFP/Getty Images)
In this image provided by the Belgian Federal Police in Brussels on Tuesday, March 22, 2016 of three men who are suspected of taking part in the attacks at Belgium's Zaventem Airport. The man at right is still being sought by the police and two others in the photo that the police issued were according to a the Belgian Prosecutors 'probably' suicide bombers. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (Belgian Federal Police via AP)
In this image provided by the Belgian Federal Police in Brussels on Tuesday, March 22, 2016, a man who is suspected of taking part in the attacks at Belgium's Zaventem Airport and is being sought by police. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (Belgian Federal Police via AP)
In this undated combination photo provided by the Belgian Federal Police in Brussels on Monday, March 21, 2016, suspect Najim Laachraoui is shown. Belgian prosecutors appealed to the public Monday for information about Laachraoui who allegedly traveled to Hungary in 2015 with the top suspect in the Paris attacks. The federal prosecutor's office said in a statement they are seeking information about 24-year-old Najim Laachraoui, who is said to have traveled to Syria in February 2013. It said Laachraoui was checked by guards at the Austria-Hungary border while driving in a Mercedes with Salah Abdeslam and one other person. (Belgian Federal Police via AP)
#BREAKING: Two loud explosions at #Zaventem airport in #Brussels https://t.co/JFw9RGLjnh
In this still image taken from video from RTL Belgium people receive treatment in the debris strewn terminal at Brussels Airport, in Brussels after explosions Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (RTL via AP) BELGIUM OUT TV OUT NO ARCHIVE
In this still image taken from video from RTL Belgium people receive treatment in the debris strewn terminal at Brussels Airport, in Brussels after explosions Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (RTL via AP) BELGIUM OUT TV OUT NO ARCHIVE
In this photo provided by Ralph Usbeck an unidentified traveller gets to his feet in a smoke filled terminal at Brussels Airport, in Brussels after explosions Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (Ralph Usbeck via AP)
In this photo provided by Ralph Usbeck a police officers directs passengers in a smoke filled terminal at Brussels Airport, in Brussels after explosions Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (Ralph Usbeck via AP)
This video footage captures the aftermath of the explosions at Zaventem airport, #Brussels https://t.co/wcsNygh91Y
In this photo provided by Georgian Public Broadcaster and photographed by Ketevan Kardava, armed security personnel are seen in Brussels Airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016. A developing situation left a number dead in explosions that ripped through the departure hall at Brussels airport Tuesday, police said. All flights were canceled, arriving planes were being diverted and Belgium's terror alert level was raised to maximum, officials said. (Ketevan Kardava/ Georgian Public Broadcaster via AP)
In this photo provided by Georgian Public Broadcaster and photographed by Ketevan Kardava two women wounded in Brussels Airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016. A developing situation left at least one person and possibly more dead in explosions that ripped through the departure hall at Brussels airport Tuesday, police said. All flights were canceled, arriving planes were being diverted and Belgium's terror alert level was raised to maximum, officials said. (Ketevan Kardava/ Georgian Public Broadcaster via AP)
In this photo provided by Georgian Public Broadcaster and photographed by Ketevan Kardava a man is wounded in Brussels Airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016. A developing situation left at least one person and possibly more dead in explosions that ripped through the departure hall at Brussels airport Tuesday, police said. All flights were canceled, arriving planes were being diverted and Belgium's terror alert level was raised to maximum, officials said. (Ketevan Kardava/ Georgian Public Broadcaster via AP)
This photo provided by Georgian Public Broadcaster and photographed by Ketevan Kardava, shows the scene in Brussels Airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016. A developing situation left a number dead in explosions that ripped through the departure hall at Brussels airport Tuesday, police said. All flights were canceled, arriving planes were being diverted and Belgium's terror alert level was raised to maximum, officials said. (Ketevan Kardava/ Georgian Public Broadcaster via AP)
In this photo provided by Ralph Usbeck an unidentified traveller gets to his feet in a smoke filled terminal at Brussels Airport, in Brussels after explosions Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (Ralph Usbeck via AP)
In this photo provided by Georgian Public Broadcaster and photographed by Ketevan Kardava a man is wounded in Brussels Airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016. A developing situation left at least one person and possibly more dead in explosions that ripped through the departure hall at Brussels airport Tuesday, police said. All flights were canceled, arriving planes were being diverted and Belgium's terror alert level was raised to maximum, officials said. (Ketevan Kardava/ Georgian Public Broadcaster via AP)
In this photo provided by Georgian Public Broadcaster and photographed by Ketevan Kardava, an injured man lies on the floor in Brussels Airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016. A developing situation left a number dead in explosions that ripped through the departure hall at Brussels airport Tuesday, police said. All flights were canceled, arriving planes were being diverted and Belgium's terror alert level was raised to maximum, officials said. (Ketevan Kardava/ Georgian Public Broadcaster via AP)
In this photo provided by Georgian Public Broadcaster and photographed by Ketevan Kardava a man is wounded in Brussels Airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016. A developing situation left a number dead in explosions that ripped through the departure hall at Brussels airport Tuesday, police said. All flights were canceled, arriving planes were being diverted and Belgium's terror alert level was raised to maximum, officials said. (Ketevan Kardava/ Georgian Public Broadcaster via AP)
In this photo provided by Ralph Usbeck travellers stand in a smoke filled terminal at Brussels Airport, in Brussels after explosions Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (Ralph Usbeck via AP)
Brussels aftermath video shows survivors huddled together, telling one another: "It's okay". https://t.co/3Y7lEXrrjP https://t.co/KdqFXR9Wft
BRUSSELS, BELGIUM - MARCH 22: Passengers are evacuated from Zaventem Bruxelles International Airport after a terrorist attack on March 22, 2016 in Brussels, Belgium. At least 13 people are though to have been killed after Brussels airport was hit by two explosions whilst a Metro station was also targeted. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Sylvain Lefevre/Getty Images)
The blown out windows of Zaventem airport are seen after a deadly attack in Brussels, Belgium, Tuesday, March 22, 2016. Authorities in Europe have tightened security at airports, on subways, at the borders and on city streets after deadly attacks Tuesday on the Brussels airport and its subway system. (AP Photo/Peter Dejong)
A private security guard helps a wounded women outside the Maalbeek metro station in Brussels on March 21, 2016 after a blast at this station located near the EU institutions. Belgian firefighters said at least 26 people had died after 'enormous' blasts rocked Brussels airport and a city metro station today, as Belgium raised its terror threat to the maximum level. / AFP / Michael VILLA (Photo credit should read MICHAEL VILLA/AFP/Getty Images)
People react as they walk away from Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Geert Vanden Wijngaert)
In this photo provided by David Crunelle, an injured woman leaves the scene at Brussels airport, after explosions rocked the facility in Brussels, Belgium, Tuesday March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing at least 13 people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (David Crunelle via AP) NO SALES - NO ARCHIVES
A picture taken on March 22, 2016 shows a Belgian police vehicle driving past passengers who are evacuating the Brussels Airport of Zaventem. At least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport on March 22, 2016, Belgian media quoted the federal prosecutor as saying. Officials were not immediately available to confirm the figure when contacted by AFP. The federal police earlier confirmed one death. / AFP / Belga / Jonas Roosens / Belgium OUT (Photo credit should read JONAS ROOSENS/AFP/Getty Images)
People react as they walk away from Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Geert Vanden Wijngaert)
People react outside Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Geert Vanden Wijngaert)
People react as they walk away from Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Geert Vanden Wijngaert)
A picture taken on March 22, 2016 shows a Belgian police vehicle driving past passengers who are evacuating the Brussels Airport of Zaventem. At least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport on March 22, 2016, Belgian media quoted the federal prosecutor as saying. Officials were not immediately available to confirm the figure when contacted by AFP. The federal police earlier confirmed one death. / AFP / Belga / Jonas Roosens / Belgium OUT (Photo credit should read JONAS ROOSENS/AFP/Getty Images)
In this image taken from TV people receive treatment as emergency services attend the scene after an explosion in a main metro station in Brussels on Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, killing at least 13 people and injuring many others just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo)
In this image taken from TV an armed member of the security forces stands guard as emergency services attend the scene after a explosion in a main metro station in Brussels on Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, killing a number of people and injuring many others just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo)
In this image made from video, emergency rescue workers stretcher an unidentified person at the site of an explosion at a metro station in Brussels, Belgium, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said.(APTN via AP)
A picture taken on March 22, 2016 shows smoke rising from the Maalbeek underground, in Brussels, following a blast at the station close to the capital's European quarter. The Brussels metro service was being shut down on March 22, its operator said. The measure came after a rush-hour explosion at Maalbeek station with TV images showing black smoke pouring from the station entrance. / AFP / Belga / Seppe KNAPEN / Belgium OUT (Photo credit should read SEPPE KNAPEN/AFP/Getty Images)
A security perimeter has been set, on March 22, 2016 near Maalbeek metro station in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. AFP PHOTO / EMMANUEL DUNAND / AFP / EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: Broken glass and blood is seen beside signage outside an entrance to Maelbeek metro station following todays attack on March 22, 2016 in Brussels, Belgium. At least 34 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: Broken glass is seen outside an entrance to Maelbeek metro station following todays attack on March 22, 2016 in Brussels, Belgium. At least 34 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
Policemen stand guard at the entrance of a security perimeter set near Maalbeek metro station, on March 22, 2016 in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. AFP PHOTO / EMMANUEL DUNAND / AFP / EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
Rescue teams evacuate wounded people outside the Maalbeek metro station in Brussels on March 22, 2016 after a blast at this station located near the EU institutions. Belgian firefighters said at least 26 people had died after 'enormous' blasts rocked Brussels airport and a city metro station today, as Belgium raised its terror threat to the maximum level. / AFP / - (Photo credit should read -/AFP/Getty Images)
Passengers evacuated after blast at #Maalbeek metro station in #Brussels via @EurActiv https://t.co/O3W8C2rpPm https://t.co/XmIoeKfE9F
In this photo provided by Evan Lamos passengers clamber from a metro carriage after explosions in Brussels Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (Evan Lamos via AP)
In this photo provided by Evan Lamos passengers walk inside the metro system after explosions in Brussels Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (Evan Lamos via AP)
In this image provided by Daniela Schwarzer, smoke is seen at Brussels airport in Brussels, Belgium, after explosions were heard Tuesday, March 22, 2016. (Daniela Schwarzer via AP)
Smoke billows from the Zaventem Airport after a controlled explosion in Brussels, Tuesday, March 22, 2016. Bombs struck the Brussels airport and one of the city's metro stations Tuesday, killing and wounding dozens of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Michel Spingler)
People are evacuated from Brussels airport in Zaventem on March 22, 2016 following twin blasts. A string of explosions rocked Brussels airport and a city metro station, killing at least 21 people in apparently coordinated attacks, officials said. == BELGIUM OUT == / AFP / Belga / DIRK WAEM / Belgium OUT (Photo credit should read DIRK WAEM/AFP/Getty Images)
A man with blood stains on his sweater leaves Brussels airport in Zaventem on March 22, 2016 following twin blasts. A string of explosions rocked Brussels airport and a city metro station, killing at least 21 people in apparently coordinated attacks, officials said. == BELGIUM OUT == / AFP / Belga / DIRK WAEM / Belgium OUT (Photo credit should read DIRK WAEM/AFP/Getty Images)
Amateur footage shows scene at #Brussels airport after explosions (video: Bart van Meele) https://t.co/v29k9dvMiM
People stand near Brussels airport after being evacuated following explosions that rocked the facility in Brussels, Belgium, Tuesday March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (AP Photo/Geert Vanden Wijngaert)
Passengers are evacuated from Brussels airport, on March 22, 2016 in Zaventem, after at least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport.AFP PHOTO / JOHN THYS / AFP / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
A victim is evacuated on a stretcher by emergency services after a explosion in a main metro station in Brussels on Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, killing at least 13 people and injuring many others just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Virginia Mayo)
People comfort each other after being evacuated from Brussels airport, after explosions rocked the facility in Brussels, Belgium, Tuesday March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing at least 13 people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (AP Photo/Geert Vanden Wijngaert)
A victim receives first aid by rescuers, on March 22, 2016 near Maalbeek metro station in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. AFP PHOTO / EMMANUEL DUNAND / AFP / EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
A woman is evacuated in an ambulance by emergency services after a explosion in a main metro station in Brussels on Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, killing at least 13 people and injuring many others just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Virginia Mayo)
In this image taken from TV an injured person is evacuated as emergency services attend the scene after an explosion in a main metro station in Brussels on Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, killing a number of people and injuring many others just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo)
A woman is evacuated by emergency services after a explosion in a main metro station in Brussels on Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, killing at least 13 people and injuring many others just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Virginia Mayo)
People react outside Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Geert Vanden Wijngaert)
A victim receives first aid by rescuers, on March 22, 2016 near Maalbeek metro station in Brussels, after a blast at this station near the EU institutions caused deaths and injuries. AFP PHOTO / EMMANUEL DUNAND / AFP / EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
A truck carrying soldiers of the Belgian Army arrives after a explosion in a main metro station in Brussels on Tuesday, March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, killing at least 13 people and injuring many others just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Virginia Mayo)
BRUSSELS, BELGIUM - MARCH 22 : Police officers stand guard around the Zaventem Airport after two explosions went off in Brussels, Belgium on March 22, 2016. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)
BRUSSELS, BELGIUM - MARCH 22 : Police officers stand guard around the Zaventem Airport after two explosions went off in Brussels, Belgium on March 22, 2016. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)
A young girl looks out of the window of a bus after being evacuated from Brussels airport, after explosions rocked the facility in Brussels, Belgium, Tuesday March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing at least 13 people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (AP Photo/Geert Vanden Wijngaert)
Passengers leave a gym where they took shelter after the explosions, near the Zaventem Airport in Brussels, Tuesday, March 22, 2016. Bombs struck the Brussels airport and one of the city's metro stations Tuesday, killing and wounding dozens of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Michel Spingler)
Passengers are gathered, on March 22, 2016 near Brussels airport in Zaventem, following its evacuation after at least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport.AFP PHOTO / JOHN THYS / AFP / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
People react as they walk away from Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Geert Vanden Wijngaert)
In this photo provided by David Crunelle, injured people leave the scene at Brussels airport, after explosions rocked the facility in Brussels, Belgium, Tuesday March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (David Crunelle via AP) NO SALES - NO ARCHIVES
BRUSSELS, BELGIUM - MARCH 22 : Police officers stand guard around the Zaventem Airport after two explosions went off in Brussels, Belgium on March 22, 2016. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)
Firefighters arrive at a security perimeter set in the Rue de la Loi near the Maalbeek subway station, in Brussels, on March 22, 2016, after an explosion killed around 10 people, according to spokesman of Brussels' fire brigade A string of explosions rocked Brussels airport and a city metro station on Tuesday, killing at least 13 people, according to media reports, as Belgium raised its terror threat to the maximum level. / AFP / Belga / LAURIE DIEFFEMBACQ / Belgium OUT (Photo credit should read LAURIE DIEFFEMBACQ/AFP/Getty Images)
Passengers who were evacuated from the airport wait in Zaventem, on March 22, 2016, after a string of explosions rocked Brussels airport of Zaventem and a city metro station, killing at least 13 people, according to media reports, as Belgium raised its terror threat to the maximum level. / AFP / Belga / SEPPE KNAPEN / Belgium OUT (Photo credit should read SEPPE KNAPEN/AFP/Getty Images)
BRUSSELS, BELGIUM - MARCH 22 : Police officers stand guard around the Zaventem Airport after two explosions went off in Brussels, Belgium on March 22, 2016. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)
People react outside Brussels airport after explosions rocked the facility in Brussels, Belgium Tuesday March 22, 2016. Explosions rocked the Brussels airport and the subway system Tuesday, just days after the main suspect in the November Paris attacks was arrested in the city, police said. (AP Photo/Geert Vanden Wijngaert)
People are evacuated from Brussels Airport, in Zaventem, on March 22, 2016. after at least 13 people have been killed by two explosions in the departure hall of Brussels Airport. / AFP / Belga / VIRGINIE LEFOUR / Belgium OUT (Photo credit should read VIRGINIE LEFOUR/AFP/Getty Images)
People stand near Brussels airport after being evacuated following explosions that rocked the facility in Brussels, Belgium, Tuesday March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. (AP Photo/Geert Vanden Wijngaert)
Passengers gather, on March 22, 2016 near Brussels airport in Zaventem , following its evacuation after at least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport.AFP PHOTO / JOHN THYS / AFP / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
Passengers leave with their luggages, on March 22, 2016 near Brussels airport in Zaventem , following its evacuation after at least 13 people were killed and 35 injured as twin blasts rocked the main terminal of Brussels airport.AFP PHOTO / JOHN THYS / AFP / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
BRUSSELS, BELGIUM - MARCH 22 : Police officers stand guard around the Zaventem Airport after two explosions went off in Brussels, Belgium on March 22, 2016. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)
A photo taken on March 22, 2016 shows Brussels Airport, in Zaventem, after two explosions rocked the main hall of the airport. At least 13 people have been killed after two explosions occured in the departure hall of Brussels Airport. Government sources speak of a terrorist attack. The terrorist threat level has been heightened to four across the country. / AFP / BELGA / DIRK WAEM / Belgium OUT (Photo credit should read DIRK WAEM/AFP/Getty Images)
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Both men, born in Belgium, had criminal records for armed robbery but investigators had not linked them to Islamist militants until Abdeslam's arrest, when police began a race against time to track down his suspected accomplices.

That seems to have prompted the bombers to rush into an attack in Belgium after months of lying low, according to the testament found on the laptop.

At least 31 people were killed and 271 wounded in the attacks, the prosecutor said. That toll could increase further because some of the bomb victims at Maelbeek metro station were blown to pieces and victims are hard to identify. Several survivors were still in critical condition.

The Bakraoui brothers were identified by their fingerprints and on security cameras, the prosecutor said. A second suicide bomber at the airport had yet to be identified and a third man, whom he did not name, had left the biggest bomb and ran out of the terminal before the explosions.

Pictured below: Khalid Bakraoui was the metro bomber, Brahim El Bakraoui was the Brussels airport bomber.

Suicide Bombers

Belgian media named that man as Najim Laachraoui, 25, a suspected Islamic State recruiter and bomb-maker whose DNA was found on two explosives belts used in last November's Paris attacks and at a Brussels safe house used by Abdeslam.

De Standaard newspaper, however, citing an unidentified source, named Laachraoui as the second suicide bomber at the airport.

Khalid El Bakraoui rented under a false name the apartment in the city's Forest borough, where police hunting Abdeslam killed a gunman in a raid last week. He is also believed to have rented a safe house in the southern Belgian city of Charleroi used to mount the Paris attacks.

"BLACK DAYS"

Turkey said it had detained Ibrahim El Bakraoui near the Syrian border last year and deported him to the Netherlands before he was briefly held in Belgium, then released. "Belgium ignored our warning that this person is a foreign fighter," President Tayyip Erdogan said.

The Brussels attacks came days after a suspected Islamic State suicide bomber blew himself up in Istanbul's most popular shopping district, killing three Israelis and an Iranian.

The Syrian-based Islamist group claimed responsibility for Tuesday's attacks, warning of "black days" for those fighting it in Syria and Iraq. Belgian warplanes have joined the coalition in the Middle East, but Brussels has long been a hub of Islamist militants who operated elsewhere.

A minute's silence was observed across Belgium at noon. Prime Minister Charles Michel canceled a trip to China and reviewed security measures with his inner cabinet before attending a memorial event at European Commission headquarters with King Philippe, Commission President Jean-Claude Juncker and French Prime Minister Manuel Valls.

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"We are determined, admittedly with a strong feeling of pain in our stomachs, but determined to act," Michel told a joint news conference with Valls. "France and Belgium are united in pain more than ever."

Valls played down cross-border sniping over security, saying: "We must turn the page on naivete, a form of carefreeness that our societies have known.

"It is Europe that has been attacked. The response to terrorism must be European."

EU justice and interior ministers will hold an emergency meeting in Brussels on Thursday, the Dutch EU presidency said.

More than 1,000 people gathered around an improvised shrine with candles and street paintings outside the Brussels bourse.

Belgium's crisis coordination center kept the level of security alert at the maximum as the man hunt continued. Some buses and trains were running but the metro and the airport were closed, along with key road tunnels in Brussels.

The blasts fueled political debate across the globe about how to combat militants.

Donald Trump, the front-runner for the Republican nomination to succeed Obama in November's U.S. election, suggested suspects could be tortured to avert such attacks. He also said in a British television interview that Muslims were not doing enough to prevent that kind of violence.

RELATED: Reaction to the bombings on social media:

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Brussels Attacks: Social media reaction
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Belgium names Brussels bomber brothers, key suspect on run
Do you all remember how beautiful and safe a place Brussels was. Not anymore, it is from a different world! U.S. must be vigilant and smart!
My heart & prayers go out to all of the victims of the terrible #Brussels tragedy. This madness must be stopped, and I will stop it.
Our hearts break for the men and women of Brussels this morning: https://t.co/Z3zl8ArMCG
These terrorists seek to undermine the democratic values that are the foundation of our way of life. They will never succeed. -H
We offer our deepest condolences to the families who lost loved ones in this barbaric attack and to the people of Brussels.
Gov. John Kasich's statement on the terrorist attacks in #Brussels. https://t.co/6gwCCMwJcy
We stand in solidarity with the people of #Brussels, and pray for the victims of this horrendous act of terror.
My thoughts and prayers are with the victims and their families who are impacted by the terrorist attacks in Brussels. #prayforbrussels
Praying for the victims, families and people of #Brussels following today’s brutal terror attacks. We must defeat radical Islamic terrorists
Statement by Attorney General @LorettaLynch on the terror attacks in Brussels https://t.co/s2A5RtUc8t https://t.co/3DsOe9W1pU
My condolences to the victims of this vicious attack along with their families and friends. Our thoughts & prayers are with Belgium today.
My thoughts are with the people of Belgium, and I join our European friends in their determination to combat the threat of terror.
.@JohnKerry was informed this morning of the terrorist bombings in Brussels. He is closely monitoring the situation, extends condolences.
Our thoughts and prayers are with the people of Belgium.
My condolences to the families of those lost today and my prayers go out to all those who have been injured. (1/2)
The US and Europe must be united in striking ISIS wherever they seek safe haven to dismantle this terrorist threat once and for all. (2/2)
We stand with the people of Belgium. These horrible acts of terror and the resulting loss of life remind us we must be vigilant...
May the God of Israel bring peace and comfort to those who mourn from the senseless death and carnage in Brussels this morning.
I strongly condemn these hateful attacks. Our thoughts go out to the victims and their families. We stand united against terrorism.
I am shocked and concerned by the events in Brussels. We will do everything we can to help.
Translation: “Through the #Brussels attacks, the whole of Europe has been hit.”
I'm outraged and deeply saddened by the news that so many have been killed and injured in terrorist attacks targeting the people of Brussels
My thoughts with #Brussels and its citizens after these heinous attacks. Stay in a safe place, follow instructions of authorities
Terror will never win. #brusselsattack
my heart goes out to the people of #Brussels this morning
Woke up to the horrible, tragic news in Brussels. Heartbreaking. Sending much love and many prayers.
Waking up to this heartbreaking news this morning. My thoughts and prayers are with you today, #Brussels. 🙏🏼 https://t.co/pKeYIZf1ok
Good morning. Prayers with Brussels today.
Praying for peace around the world. Brussels my heart breaks for you.
I was supposed to be in the Beautiful city of Brussels soon...My heart is with you all.So terrible https://t.co/9c2SdYioGU
Sympathies, #Brussels. Keep strong & smart. As must we all. 🇧🇪 https://t.co/esLUUjoiMP
Beyond sad and outraged that the scourge of the earth continue to feel the need to kill innocent people everywhere. #Brussels #WeStandWithU
Prayers for #Brussels.
Waking up once again with a heavy heart. Thoughts and prayers for Brussels. https://t.co/KdCpqwZMD2
All we need is love in a time like this❤️ #LoveForAll #Brussels https://t.co/lztM5wMnC1
More violence. More innocent lives lost. More anguish. More anger. Only thing lessening is Hope. Heart goes out to all affected. #Brussels
I am extremely concerned for all caught up in unfolding events in Brussels. Solidarity with emergency services & those affected.
Woke to horrible news in Brussels. My heart and prayers to everyone. Hold your loved ones close every day.
Our thoughts are with the victims of these terrible attacks and with the people of Brussels. We stand with you today and always.
Prayers going out to everyone in Brussels this morning
We're deeply saddened by the news out of #Brussels today. Our thoughts and prayers are with everyone affected.
Thoughts and prayers to all our friends in Brussels. Shocking scenes in such a friendly and fun city.
Terrible acts of terrorism in #Brussels. Stand in solidarity with all those affected.
Thinking of our beautiful fans and everyone in #Brussels . Please be careful. Please. ❤️
My heart goes out to Brussels. What a horrific tragedy. #prayforbrussels
Praying for Brussels
Terrorism is one of the scariest things. It does not function like anything else in this world.… https://t.co/fL96Cevclp
Video shared by @ABconcerts shows some of the solidarity messages in chalk that have appeared in central Brussels https://t.co/xB5WzXxxce
Our hearts are with you, #Brussels. Art by @geesubay https://t.co/9yPaIOdlu2
My heart goes out to all effected by the terrorist attacks in #Brussels. Too much hate and disregard for all life in this world. It's sad
Saddened to wake up to this news. Hard to believe there is so much hate in this world when all you want to believe in is the good.
My heart is broken. These events have eternal impact on the lives of countless people. #Brussels, you're in my prayers
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After a tip-off from a taxi driver who unwittingly drove the bombers to the airport, police searched an apartment in the Brussels borough of Schaerbeek late into the night, finding another bomb, an Islamic State flag, 15 kg of the same kind of explosives used in the Paris attacks and bomb-making chemicals.

An unused explosive device was also found at the airport.

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Security experts believed the blasts were probably in preparation before Friday's arrest of locally based French national Abdeslam, 26, whom prosecutors accuse of a key role in the Nov. 13 Paris attacks.

He was caught and has been speaking to investigators after a shootout at an apartment in the south of the city, after which another Islamic State flag and explosives were found.

About 300 Belgians are estimated to have fought with Islamists in Syria, making the country of 11 million the leading European exporter of foreign fighters and a focus of concern in France and other neighbors over its security capabilities.

Reviving arguments over Belgian security policies following the Paris attacks, in which 130 people died in an operation apparently organized from Brussels, French Finance Minister Michel Sapin spoke of "naiveté" on the part of "certain leaders" in holding back from security crackdowns on Muslim communities.

Belgian Foreign Minister Didier Reynders retorted that each country should look to its own social problems, saying France too had rough high-rise suburbs in which militants had become radicalized. Valls said France had no place teaching Belgium lessons and had problems with its own communities.

Brussels airport seemed likely to remain shut for several days over the busy Easter holiday weekend, since the departure hall was still being combed as a crime scene on Wednesday and repairs can only begin once investigators are finished.

See memorials set up in the wake of the attacks:

58 PHOTOS
Memorials in Brussels after attacks
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Belgium names Brussels bomber brothers, key suspect on run
People holding a banner reading "I am Brussels" behind flowers and candles to mourn for the victims at Place de la Bourse in the center of Brussels, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner)
Young women hold each other at a makeshift memorial in front of the stock exchange at the Place de la Bourse (Beursplein) in Brussels on March 22, 2016, following triple bomb attacks in the Belgian capital that killed about 35 people and left more than 200 people wounded. A series of explosions claimed by the Islamic State group ripped through Brussels airport and a metro train on March 22, killing around 35 people in the latest attacks to bring bloody carnage to the heart of Europe. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
People bring flowers and candles to mourn at the Place de la Bourse in the center of Brussels, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
TOPSHOT - A photo taken on March 22, 2016 shows a sign peace made of candles in front of the Bourse of Brussels in tribute to the victims of Brussels following triple bomb attacks in the Belgian capital that killed about 35 people and left more than 200 people wounded. Belgium launched a huge manhunt on March 22 after a series of bombings claimed by the Islamic State group ripped through Brussels airport and a metro train, killing around 35 people in the latest attack to bring carnage to the heart of Europe. / AFP / BELGA / Aurore Belot / Belgium OUT (Photo credit should read AURORE BELOT/AFP/Getty Images)
TOPSHOT - People light candles in tribute to victims at a makeshift memorial in front of the stock exchange at the Place de la Bourse (Beursplein) in Brussels on March 22, 2016, following triple bomb attacks in the Belgian capital that killed about 35 people and left more than 200 people wounded. A series of explosions claimed by the Islamic State group ripped through Brussels airport and a metro train on March 22, killing around 35 people in the latest attacks to bring bloody carnage to the heart of Europe. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: A young girl lights a candle at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
TOPSHOT - People stand hand in hand in tribute to victims at a makeshift memorial in front of the stock exchange at the Place de la Bourse (Beursplein) in Brussels on March 22, 2016, following triple bomb attacks in the Belgian capital that killed about 35 people and left more than 200 people wounded. A series of explosions claimed by the Islamic State group ripped through Brussels airport and a metro train on March 22, killing around 35 people in the latest attacks to bring bloody carnage to the heart of Europe. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
A message written on the ground reads 'Brussels is beautiful' next to flowers and candles following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People gather at Place de la Bourse in support of the victims after the terrorist attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Aurelien Meunier/Getty Images)
People bring flowers and candles to mourn at the Place de la Bourse in the center of Brussels, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner)
BRUSSELS, BELGIUM - MARCH 22: People light candles at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People hold up a banner as a mark of solidarity at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: Candles are lit at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
People bring flowers and candles to mourn for the victims at Place de la Bourse in the center of Brussels, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner)
People mourn for the victims at Place de la Bourse in the center of Brussels, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner)
A placard reads 'Share your love' at a makeshift memorial following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
Writing on the asphalt reads "More stars in Brussel's heaven" at Place de la Bourse in the center of Brussels, where people write hundreds of messages on the ground to remember the victims of Tuesday's attack, Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing and wounding scores of people, as a European capital was again locked down amid heightened security threats. (AP Photo/Martin Meissner)
A woman reads messages written on the ground at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
People walk over messages written on the ground at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
People leave candles and flowers in tribute to victims of triple bomb attacks in front of the stock exchange building in the city center of Brussels on March 22, 2016. A series of apparently coordinated explosions ripped through Brussels airport and a metro train, killing at least 26 people in the latest attacks to target Europe. / AFP / Belga / NICOLAS MAETERLINCK / Belgium OUT (Photo credit should read NICOLAS MAETERLINCK/AFP/Getty Images)
People leave messages and flowers in tribute to victims of triple bomb attacks in front of the stock exchange building in the city center of Brussels on March 22, 2016. A series of apparently coordinated explosions ripped through Brussels airport and a metro train, killing at least 26 people in the latest attacks to target Europe. / AFP / Belga / NICOLAS MAETERLINCK / Belgium OUT (Photo credit should read NICOLAS MAETERLINCK/AFP/Getty Images)
People gather around a makeshift memorial at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
A placard reads share your love next to flowers and candles laid on the ground following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
A man looks at flowers and messages outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
A woman places candles in the shape of a heart outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
Solidarity messages are written in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
A heart in the colours of the Belgian flag is taped onto a bag as people gather around a makeshift memorial following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
People write messages on the ground at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
A man writes the word 'Peace' in different languages at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
Two people write solidarity messages in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
A man walks by solidarity messages written in chalk outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. At least 26 people were reported dead. (AP Photo/Geert Vanden Wijngaert)
A replica of the Manneken Pis statue stands at a makeshift memorial at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
People hold hands as they gather at a makeshift memorial at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
People hold hands as they gather at a makeshift memorial at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
People light candles at a makeshift memorial at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
A replica of the Manneken Pis statue is placed among candles at a makeshift memorial at Place de la Bourse (Beursplein) following attacks in Brussels on March 22, 2016. Airlines cancelled hundreds of flights and European railways froze links with Brussels after a series of bomb blasts killed around 35 people in the city's airport and a metro train, sparking a broad security response. AFP PHOTO / KENZO TRIBOUILLARD / AFP / KENZO TRIBOUILLARD (Photo credit should read KENZO TRIBOUILLARD/AFP/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: People walk across slogans written on the ground in chalk saying 'Brussels, Belgium, Today' at Beursplein sqaure following todays attack on March 22, 2016 in Brussels, Belgium. At least 34 people are thought to have been killed after Brussels airport and the Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. on March 22, 2016 in Brussels, Belgium. (Photo by Alexander Koerner/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: A painting is left as a tribute at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: A message is written on a wall following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: Flowers are placed into the mouth of a lion statue as people gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
BRUSSELS, BELGIUM - MARCH 22: A candle is lit as people gather to leave tributes at the Place de la Bourse following today's attacks on March 22, 2016 in Brussels, Belgium. At least 31 people are thought to have been killed after Brussels airport and a Metro station were targeted by explosions. The attacks come just days after a key suspect in the Paris attacks, Salah Abdeslam, was captured in Brussels. (Photo by Carl Court/Getty Images)
A man lights a candle next to the iconic statue of Manneken Pis outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Geert Vanden Wijngaert)
A memorial to attack victims with a Belgian flag and flowers is set up outside the stock exchange in Brussels on Tuesday, March 22, 2016. Explosions, at least one likely caused by a suicide bomber, rocked the Brussels airport and subway system Tuesday, prompting a lockdown of the Belgian capital and heightened security across Europe. (AP Photo/Geert Vanden Wijngaert)
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