Istanbul Nightclub New Year's Eve Terror Attack

Ambulances wait near the scene of an attack in Istanbul, early Jan. 1, 2017.

Police forensic experts examine an area near an Istanbul nightclub, following a gun attack, Jan. 1, 2017.

Young people leave the scene of an attack in Istanbul, early Jan. 1, 2017. An assailant opened fire at a nightclub in Istanbul's Ortakoy district during New Year's celebrations, killing dozens of people and wounding dozens more.

Youths embrace near the scene of an attack in Istanbul, early Jan. 1, 2017. An assailant believed to have been dressed in a Santa Claus costume and armed with a long-barreled weapon, opened fire at a nightclub in Istanbul's Ortakoy district.

People run from a nightclub where a gun attack took place during a New Year party in Istanbul, Jan. 1, 2017.

Young people leave the scene of an attack in Istanbul, early Jan. 1, 2017. Turkey's state-run news agency said an armed assailant has opened fire at a nightclub in Istanbul's Ortakoy district.

People flee from a nightclub where a gun attack took place during a New Year party in Istanbul, Jan. 1, 2017.

Police secure area near an Istanbul nightclub, Jan. 1, 2017.

Police secure the area near an Istanbul nightclub, following a gun attack, in Turkey, Jan. 1, 2017.

Turkish police officers block the road leading to the scene of an attack in Istanbul, early Jan. 1, 2017.

A nightclub where a gun attack took place during a New Year's party, Jan. 1, 2017 in Istanbul, pictured Aug. 8, 2015.