ISIS leadership involved in Istanbul attack planning, Turkish source says

Istanbul suspects apartment --------------- Nima Elbagir reports from a neighborhood where the Istanbul suspects are believed to have lived

Istanbul attackers are believed to be ISIS members from Dagestan, Uzbekistan, and Kyrgyzstan. Are those countries significant suppliers of ISIS recruits?

Istanbul attack suicide bomber

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Istanbul couple survival story watson dnt

People wait in a security line operated by the Transportation Security Administration at John F. Kennedy Airport in New York City.

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DIYARBAKIR, TURKEY - MARCH 21: Kurdish men flash v-signs as they hold up a flag with a picture of the jailed PKK leader Abdullah Ocalan during Newroz celebrations, on March 21, 2015 in Diyarbakir, Turkey. Thousands of Kurds gather for the Newroz spring festival in Diyarbakir in southeast Turkey under tight security after months of fighting between security forces and Kurdish separatists, and a series of bombings in Istanbul and Ankara. (Photo by Ulas Tosun/Getty Images)

A protester holds up a Turkish flag as others raise their hands during a demonstration in Taksim square in Istanbul on June 8, 2013. Thousands of angry Turks took to the streets on June 8 to join mass anti-government protests, defying Prime Minister Recep Tayyip Erdogan's call to end the worst civil unrest of his decade-long rule. Erdogan, meanwhile, was meeting in Istanbul with top officials of his Justice and Development Party (AKP) to discuss the crisis, and a deputy prime minister was due to make a speech later on June 8. AFP PHOTO/BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)

Aftermath of the Istanbul Ataturk Airport

Donald Trump Ohio rally

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ISTANBUL, TURKEY - JUNE 28: Turkish police blocks the road as relatives of the passengers wait outside the Turkey's largest airport, Istanbul Ataturk, after the suicide bomb attack on June 28, 2016 in Istanbul, Turkey. Three suicide bombers opened fire before blowing themselves up at the entrance to the main international airport in Istanbul, killing at least 28 people and wounding at least 60 people, according to Istanbul governor Vasip Sahin. (Photo by Mehmet Ali Poyraz/Getty Images)

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Investigators inspect a truck following a shooting incident in New York on October 31, 2017. Several people were killed and numerous others injured in New York on Tuesday when a suspect plowed a vehicle into a bike and pedestrian path in Lower Manhattan, and struck another vehicle on Halloween, police said. A suspect exited the vehicle holding up fake guns, before being shot by police and taken into custody, officers said. The motive was not immediately apparent. / AFP PHOTO / Don EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)