Month-by-month, and in many cases, day-by-day the number of terror attacks across the world increased in 2016. First it was Brussels, then it was Orlando, soon after that it was Nice and this December it was Berlin. Unfortunately those are just some of the tragedies that made headlines this year. Terror groups including ISIS, Al-Shabab, Boko Haram and al-Qaeda have left behind trails of destruction worldwide.
2016: A year in terror
2016: A year in terror
Federal Bureau of Investigation (FBI) officials collect evidence from the parking lot of the Pulse gay night club, the site of a mass shooting days earlier, in Orlando, Florida, U.S., June 15, 2016.
(REUTERS/Adrees Latif/File Photo)
Security and rescue workers tend to the area after a lorry truck ploughed through a Christmas market on December 20, 2016 in Berlin, Germany. So far 12 people are confirmed dead and 45 injured. Authorities have confirmed they believe the incident was an attack and have arrested a Pakistani man who they believe was the driver of the truck and who had fled immediately after the attack. Among the dead are a Polish man who was found on the passenger seat of the truck. Police are investigating the possibility that the truck, which belongs to a Polish trucking company, was stolen.
(Photo by Michele Tantussi/Getty Images)
Two members of the Federal Bureau of Investigation (FBI) work at the scene of Saturday night's explosion in the Chelsea neighborhood of Manhattan, September 18, 2016 in New York City. Following the explosion, Mayor Bill de Blasio has promised a 'substantial' police presence throughout the week. New York Governor Andrew Cuomo also said an additional 1,000 New York State and National Guard troops will patrol transit stations and airports as a precaution.
(Photo by Drew Angerer/Getty Images)
French police forces and forensic officers stand next to a truck July 15, 2016 that ran into a crowd celebrating the Bastille Day national holiday on the Promenade des Anglais killing at least 60 people in Nice, France, July 14.
Broken windows seen at the scene of explosions at Zaventem airport near Brussels, Belgium, March 22, 2016.
Police keep the roads closed around Watts Hall following an attack on the campus of the Ohio State University on November 28, 2016 in Columbus, Ohio. At least nine people were injured when a suspect reportedly drove into a crowd of pedestrians and slashed several people with a knife before being fatally shot by university police.
(Photo by Kirk Irwin/Getty Images)
Forensic officers look for evidence at the site of a blast that happened outside a public park on Sunday, in Lahore, Pakistan, March 28, 2016.
A still image from surveillance video shows a gunman (L) approaching a Philadelphia Police vehicle in which Officer Jesse Hartnett was shot shortly before midnight January 7, 2016 in Philadelphia, Pennsylvania this Philadelphia Police Department image released on January 8, 2016. A gunman claiming to have pledged allegiance to Islamic State militants shot and seriously wounded a Philadelphia police officer in an ambush on his patrol car, the city's police commissioner said.
(REUTERS/Philadelphia Police Department/Handout)
A Somali policeman walks at the scene of an explosion following an attack in Somalia's capital Mogadishu, March 9, 2016. Islamist group al Shabaab said it fought off an attack on one of its bases in southern Somalia early on Wednesday that was launched by foreign commandos who flew in on two helicopters, leaving one al Shabaab fighter dead in the gun battle.
People gather at the site of a car bomb attack in Baghdad's mainly Shi'ite district of Sadr City, Iraq, May 17, 2016.
(REUTERS/Khalid al Mousily)
A civilian looks out from a window of a damaged building at the site of a car bomb on the outskirts of the Sayeda Zeinab district south of Damascus, Syria, April 25, 2016.
Chemical experts inspect the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016.
Nema officials at the scene of a bomb blast in Maiduguri, Nigeria on 12 October 2016. Many traders and travelers were feared killed as an improvised explosive suspected to have been planted by Boko Haram insurgents went off outside a car park in Maiduguri, Borno state.
(Photo by next24online/NurPhoto via Getty Images)
A Pakistani army soldier takes picture of suicide blast site in a shrine of Sufi saint Shah Noorani, some 460 miles south of Quetta, on November 13, 2016. At least 52 people died and more than 100 others were injured Saturday in a bomb blast at a remote Sufi shrine in Pakistan, officials said, with the Islamic State group claiming the attack.
(ASIF HASSAN/AFP/Getty Images)
Bangladeshi officials stand near some of the body bags with the bodies of foreigners that were killed at an upscale cafe in Dhaka on July 2, 2016, after a bloody siege at the restaurant came to an end. Bangladesh began observing two days of national mourning on July 3 after 20 hostages were slaughtered at a restaurant packed with foreigners in a terrifying escalation of a campaign of attacks by Islamist extremists.
Flowers are seen placed in front of the Obelisk of Theodosius where Tuesday's suicide bomb attack took place at Sultanahmet square in Istanbul, Turkey January 13, 2016.
Children stand near the rubble of a burnt house after Boko Haram attacks at Dalori village on the outskirts of Maiduguri in northeastern Nigeria on January 31, 2016. Around 50 people were killed when Boko Haram fighters armed with guns and explosives attacked a village in northeastern Nigeria, medics and local residents said on on January 31. Nigeria's army said the gunmen attacked Dalori just outside the northern city of Maiduguri late on January 30, burning down the village and sending residents fleeing into the bush.
Broken glass and debris are seen inside a restaurant a day after a suicide attack in Kabul, Afghanistan July 24, 2016.
Resident Carlos Diaz, with his arm in the colors of the rainbow, raises a candle during a vigil in memory of victims one day after a mass shooting at the Pulse gay night club in Orlando, Florida, U.S., June 13, 2016.
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)
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The United States saw its deadliest mass shooting in history when a man opened fired inside Pulse nightclub in Orlando, Florida in June. Forty-nine people were killed and dozens more were injured in the rampage at the gay nightclub. President Obama called the attack 'an act of terror and an act of hate,' and the suspect, Omar Mateen, pledged allegiance to ISIS.
A month later, a truck was driven into a crowd celebrating Bastille Day in Nice, France -- killing at least 85 people, including ten children. Investigators say hundreds of others were also injured in the attack when the suspect, Mohamed Lahouaiej Bouhel, ploughed the 20-ton truck into the crowd. He was later shot and killed by police. ISIS claimed responsibility for the attack, calling the suspect one of their 'soldiers'.
In September, an explosion in the Chelsea neighborhood of Manhattan was linked to a man who the FBI says praised al-Qaeda. The blast in New York injured 30 people and the suspect, Ahmad Khan Rahami, was also charged with detonating a pipe bomb in New Jersey.
Earlier in the year, tragedy struck Belgium when a series of explosives were detonated at Brussels Airport and on the Brussels subway. The attacks in March -- carried out by suicide bombers killed at least 32 people and injured more than 300 others. Investigators have linked the suspects to the same terror cell reportedly involved in the 2015 attacks in Paris.
And in December there was an attack in Berlin that was tragically similar to the one in Nice. A truck rampage at a Christmas market left 12 dead and more than 50 injured. The suspect, Anis Amri, was killed in a shootout with police in Italy and video emerged of him pledging his allegiance to the Islamic State.