Turkey arrests 13 over Istanbul airport attack: State media

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Istanbul attack has 'all the hallmarks of ISIS,' terror expert says

Turkish police arrested 13 people in connection with the deadly attack on Istanbul's airport, officials said Thursday.

More than 40 people died and over 200 were injured when assailants with guns and explosives hit the airport on Tuesday.

SEE ALSO: Palestinian kills teen in Israeli settlement, then shot dead: army

Officials have said the coordinated assault on Ataturk airport bore the hallmarks of ISIS, but there has been no official claim of responsibility.

Anti-terror police carried out 16 raids in relation to the Ataturk attack overnight. Interior Minister Efkan Ala told Turkey's Parliament that 13 people — including four foreigners — had been arrested.

Those suspects have been transferred to police headquarters while another three individuals are currently being searched for, Anadolu reported.

Turkish officials have not publicly identified the attackers. Police sources told NBC News that assailants were Russian, Uzbek and Kyrgyz.

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Ataturk airport attack in Istanbul
An entrance of the Ataturk Airport in Istanbul after explosions, Tuesday, June 28, 2016. Two explosions have rocked Istanbul's Ataturk airport, killing at least 10 people and wounding around 20 others, Turkey's justice minister and another official said Tuesday. (DHA via AP) 
ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY AND DEATH Forensic experts work outside Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast, June 28, 2016. REUTERS/Murad Sezer
People phone and wait with their luggage outside the Ataturk airport in Istanbul, on June 28, 2016, after two explosions followed by gunfire hit the Turkey's biggest airport, killing at least 28 people and injured 20. All flights at Istanbul's Ataturk international airport were suspended on June 28, 2016 after a suicide attack left at least 10 people dead and 20 others wounded, Turkish television stations reported. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
Turkish police officers stand outside Istanbul's Ataturk airport, late Tuesday, June 28, 2016. Two explosions have rocked Istanbul's Ataturk airport, killing several people and wounding others, Turkey's justice minister and another official said Tuesday. A Turkish official says two attackers have blown themselves up at the airport after police fired at them. The official said the attackers detonated the explosives at the entrance of the international terminal before entering the x-ray security check. (AP Photo/Emrah Gurel) TURKEY OUT
Bodies are seen outside Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast, June 28, 2016. REUTERS/Ismail Coskun/IHLAS News Agency. 
Medics and security members work at the entrance of the Ataturk Airport after explosions in Istanbul, Tuesday, June 28, 2016. Two explosions have rocked Istanbul's Ataturk airport, killing several people and wounding others, Turkey's justice minister and another official said Tuesday. A Turkish official says two attackers have blown themselves up at the airport after police fired at them. The official said the attackers detonated the explosives at the entrance of the international terminal before entering the x-ray security check. (IHA via AP) 
Turkish rescue services gather outside Istanbul's Ataturk airport, Tuesday, June 28, 2016. Two explosions have rocked Istanbul's Ataturk airport, killing several people and wounding others, Turkey's justice minister and another official said Tuesday. A Turkish official says two attackers have blown themselves up at the airport after police fired at them. The official said the attackers detonated the explosives at the entrance of the international terminal before entering the x-ray security check. (AP Photo/Emrah Gurel)
This picture obtained from the Ilhas News Agency shows ambulances and police intervening next to injured people lying on the ground, after two explosions followed by gunfire hit the Turkey's biggest airport of Ataturk in Istanbul, on June 28, 2016. At least 10 people were killed on June 28, 2016 evening in a suicide attack at the international terminal of Istanbul's Ataturk airport, Turkish Justice Minister Bekir Bozdag said. Turkey has been hit by a string of deadly attacks in the past year, blamed on both Kurdish rebels and the Islamic State jihadist group. (Photo credit should read -/AFP/Getty Images)
A man carries his daughter outside as people leave the airport after two explosions followed by gunfire hit the Turkey's biggest airport of Ataturk in Istanbul, on June 28, 2016. At least 10 people were killed on June 28, 2016 evening in a suicide attack at the international terminal of Istanbul's Ataturk airport, Turkish Justice Minister Bekir Bozdag said. Turkey has been hit by a string of deadly attacks in the past year, blamed on both Kurdish rebels and the Islamic State jihadist group. (Photo credit should read OZAN KOSE/AFP/Getty Images)
Passengers wait with their luggage outside the Ataturk airport in Istanbul, on June 28, 2016, after two explosions followed by gunfire hit the Turkey's biggest airport, killing at least 10 people and injured 20. All flights at Istanbul's Ataturk international airport were suspended on June 28, 2016 after a suicide attack left at least 10 people dead and 20 others wounded, Turkish television stations reported. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
This picture obtained from the Ilhas News Agency shows emergency workers caring for an injured woman lying on the ground, after two explosions followed by gunfire hit the Turkey's biggest airport of Ataturk in Istanbul, on June 28, 2016. At least 10 people were killed on June 28, 2016 evening in a suicide attack at the international terminal of Istanbul's Ataturk airport, Turkish Justice Minister Bekir Bozdag said. Turkey has been hit by a string of deadly attacks in the past year, blamed on both Kurdish rebels and the Islamic State jihadist group. / AFP / ILHAS NEWS AGENCY / - / Turkey OUT (Photo credit should read -/AFP/Getty Images)
Turkish rescue services gather outside Istanbul's Ataturk airport, Tuesday, June 28, 2016. Two explosions have rocked Istanbul's Ataturk airport, killing several people and wounding others, Turkey's justice minister and another official said Tuesday. A Turkish official says two attackers have blown themselves up at the airport after police fired at them. The official said the attackers detonated the explosives at the entrance of the international terminal before entering the x-ray security check. (Ismail Coskun, IHA via AP) TURKEY OUT
Bodies are seen outside Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast, June 28, 2016. REUTERS/Ismail Coskun/IHLAS News Agency
ISTANBUL, TURKEY - JUNE 28: Police blocks the entrance of the Ataturk International Airport after an explosion, in Istanbul, Turkey on June 28, 2016. Unspecified number of injured in explosion at Istanbul's Ataturk International Airport. (Photo by Veli Gurgah/Anadolu Agency/Getty Images)
An injured person sits in an ambulance outside Istanbul's Ataturk airport, Tuesday, June 28, 2016. Two explosions have rocked Istanbul's Ataturk airport, killing several people and wounding scores of others, Turkey's justice minister and another official said Tuesday. A Turkish official says two attackers have blown themselves up at the airport after police fired at them. The official said the attackers detonated the explosives at the entrance of the international terminal before entering the x-ray security check. (AP Photo/Emrah Gurel)
Officials walk inside Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY AND DEATHBodies are seen outside Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast, June 28, 2016. REUTERS/Ismail Coskun/IHLAS News Agency. TURKEY OUT. NO COMMERCIAL OR EDITORIAL SALES IN TURKEY. NO RESALES. NO ARCHIVE. TPX IMAGES OF THE DAY
In this image taken from DHA TV, a police cordon is set up outside Istanbul's Ataturk airport, Tuesday June 28, 2016. Two explosions rocked Istanbul's Ataturk airport on Tuesday evening, according to a Turkish official. (DHA TV via AP)
In this image taken from DHA TV, a police cordon is set up outside Istanbul's Ataturk airport, Tuesday June 28, 2016. Two explosions rocked Istanbul's Ataturk airport on Tuesday evening, according to a Turkish official. (DHA TV via AP) TURKEY OUT.
Ambulance cars arrive at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
Ambulance cars arrive at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
Ambulance cars arrive at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Murad Sezer
Ambulance cars arrive at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
Ambulance cars arrive at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
Paramedics help a man in a wheelchair at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
Ambulance cars arrive at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
Ambulance cars arrive at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
ISTANBUL, TURKEY - JUNE 28: Entrance of the Ataturk International Airport after an explosion, in Istanbul, Turkey on June 28, 2016. Unspecified number of injured in explosion at Istanbul's Ataturk International Airport. (Photo by Veli Gurgah/Anadolu Agency/Getty Images)
Ambulance cars arrive at Turkey's largest airport, Istanbul Ataturk, Turkey, June 28, 2016. REUTERS/Osman Orsal
Paramedics push a stretcher at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Osman Orsal
Turkish rescue services gather outside Istanbul's Ataturk airport, Tuesday, June 28, 2016. Two explosions have rocked Istanbul's Ataturk airport, killing several people and wounding scores of others, Turkey's justice minister and another official said Tuesday. A Turkish official says two attackers have blown themselves up at the airport after police fire at them. The official said the attackers detonated the explosives at the entrance of the international terminal before entering the x-ray security check. (AP Photo/Emrah Gurel)
Armed security walks at Turkey's largest airport, Istanbul Ataturk, Turkey, following a blast June 28, 2016. REUTERS/Murad Sezer
EDITORS NOTE: Graphic content / A policeman gestures at an ambulance after two explosions followed by gunfire hit the Turkey's biggest airport of Ataturk in Istanbul, on June 28, 2016. At least 10 people were killed on June 28, 2016 evening in a suicide attack at the international terminal of Istanbul's Ataturk airport, Turkish Justice Minister Bekir Bozdag said. Turkey has been hit by a string of deadly attacks in the past year, blamed on both Kurdish rebels and the Islamic State jihadist group. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
EDITORS NOTE: Graphic content / People stand outside the entrance as they leave the airport after two explosions followed by gunfire hit the Turkey's biggest airport of Ataturk in Istanbul, on June 28, 2016. At least 10 people were killed on June 28, 2016 evening in a suicide attack at the international terminal of Istanbul's Ataturk airport, Turkish Justice Minister Bekir Bozdag said. Turkey has been hit by a string of deadly attacks in the past year, blamed on both Kurdish rebels and the Islamic State jihadist group. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
Many relatives waiting for loved ones outside Ataturk Airport https://t.co/g7KISOS3vF
Atatürk havalimanında patlamalar silah sesleri https://t.co/EqAz8TUuLK
Hearing news about shootings and suicide bomb blasts at #Istanbul Ataturk International Airport. Ohh not again :( https://t.co/Mgpo3wVhtf
Turkish official says two explosions in Ataturk airport, multiple injuries
Atatürk hava limani bombali saldiri yapildi https://t.co/qWpnLX7sGk
Successive explosions occurred at entrance to the passenger terminal at #Ataturk International Airport in #Istanbul-possibly suicide bombers
#pts: Judging from pics, attack targeted #Ataturk’s International Terminal, which has pre-check-in security measures https://t.co/I4RlXj3kyz
Pictures circulating on Twitter are showing the devastation and panic in Istanbul Ataturk Airport https://t.co/D3XKXUbUv4
#SONDAKİKA! Atatürk Havalimanı'nda patlama... Yaralılar var... İşte ilk görüntüler https://t.co/NPG6labTAh
Heart hurts. #Turkey, stay strong. #Ataturk
CNN Turk just said 30 ambulances are at Istanbul Ataturk airport.
Injuries reported at the international terminal of Istanbul Ataturk Airport after an explosovia @140journos https://t.co/tvQKg1mYjs
Bombings confirmed to have occurred at #Ataturk International Arrivals/Departures terminal entrance. Suicide bombings increasingly likely
Photos and reports from Ataturk Airport look like 1st suicide bomber detonated outside checkpoint, opening way into terminal for 2nd bomber.
Turkish official: two suicide bombers detonated explosives at entrance of int'l terminal of Ataturk airport after police shot at them.
At least 10 people have been killed in a suicide bombing at Istanbul Ataturk airport: justice minister
Anyone who's ever been knows #Istanbul's Ataturk airport is extremely well protected. This is huge and required careful planning.
Flew through Ataturk airport over spring break. 6 layers of security between terminal doors and plane. How far out can perimeter go?
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Up to 2,000 Central Asians are fighting for ISIS in Syria and Iraq, U.S. intelligence sources recently told NBC News on condition of anonymity.

Separately, nine people with suspected ties to ISIS were arrested in the coastal Izmir early Thursday, according to Anadolu Agency, which said 200 police officers participated in the operation. It was not immediately clear if those arrests were in relation to the airport attack.

The country is grappling with a number of enemies domestically and abroad — participating in the U.S.-led coalition against ISIS while battling an ongoing insurgency from the Kurdistan Workers' Party, or PKK.

Turkey's military said Thursday that its fighter jets had struck PKK targets in southeastern Turkey and northern Iraq a day earlier. The state-run Anadolu Agency reported that eight targets were destroyed.

The operations came as the death toll climbed to 44 on Thursday — including 19 foreigners — and funerals continued for the victims.

Around 90 of the more than 200 people injured in the attack remained hospitalized, the Istanbul governor's office said in a statement.

Hundreds of people gathered for a moment of silence and emotional memorial at the airport. Check-in screens showed the image of a black ribbon and a large table covered in black cloth bore framed pictures of the victims.

After the prayer, those gathered threw red carnations onto the impromptu shrine before breaking into the Turkish national anthem.

Outside of the terminal around a dozen ground handlers gathered after the memorial, waiting to head to a colleague's funeral.

"We're all still in shock," one told NBC News.

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