People talk to medics in an ambulance near the scene of an attack in Istanbul, early Sunday, January 1, 2017. Turkey's state-run news agency said an armed assailant has opened fire at a nightclub in Istanbul during New Year's celebrations. (Photo by AP Photo)





An ambulance rushes from the scene of an attack in Istanbul, early Sunday, January 1, 2017. (Photo by Halit Onur Sandal/AP Photo)





Medics and security officials work at the scene after an attack at a popular nightclub in Istanbul, early Sunday, January 1, 2017. (Photo by IHA via AP Photo)





A police armoured vehicle blocks the road leading to the scene of an attack in Istanbul, early Sunday, January 1, 2017. Private NTV television said more than one assailant may have been involved in the attack. The attacker or attackers are believed to have entered the nightclub in Istanbul's Ortakoy district disguised as Santa Claus, the station reported. (Photo by AP Photo)





Ambulances rush on the scene of an attack in Istanbul, early Sunday, January 1, 2017. (Photo by AP Photo)





Youths embrace near the scene of an attack in Istanbul, on New Year's Day, early Sunday, January 1, 2017. An assailant believed to have been dressed in a Santa Claus costume and armed with a long-barrelled weapon, opened fire at a nightclub in Istanbul's Ortakoy district during New Year's celebrations, killing dozens of people and wounding dozens of others in what the province's governor described as a terror attack. (Photo by Depo Photos via AP Photo)





Young people leave from the scene of an attack in Istanbul, early Sunday, January 1, 2017. (Photo by Halit Onur Sandal/AP Photo)





Medics carry a wounded person at the scene after an attack at a popular nightclub in Istanbul, early Sunday, January 1, 2017. Istanbul Governor Vasip Sahin said that an armed assailant has opened fire at a nightclub in Istanbul during New Year's celebrations. Turkish authorities have banned distribution of images relating to the Istanbul attack within Turkey. (Photo by IHA via AP Photo)





A woman reacts next to an ambulance near the scene of an attack in Istanbul, early Sunday, January 1, 2017. (Photo by AP Photo)





Turkish police officers block the road leading to the scene of an attack in Istanbul, early Sunday, January 1, 2017. (Photo by Depo Photos via AP Photo)





Young people leave from the scene of an attack in Istanbul, early Sunday, January 1, 2017. (Photo by Halit Onur Sandal/AP Photo)





Medics carry a wounded person at the scene after an attack at a popular nightclub in Istanbul, early Sunday, January 1, 2017. (Photo by IHA via AP Photo)





Medics and security officials work at the scene after an attack at a popular nightclub in Istanbul, early Sunday, January 1, 2017. (Photo by IHA via AP Photo)





People flee as ambulances are on the attack site on January 1, 2017 in Istanbul. .At least two people were killed in an armed attack Saturday on an Istanbul nightclub where people were celebrating the New Year, Turkish television reports said. (Photo by AFP Photo/Ihlas News Agency)