Interior bar of the Reina nightclub by the Bosphorus, which was attacked by a gunman, is pictured in Istanbul, Jan. 3, 2017. Murad Sezer/Reuters

The sister of Elias Wardini, a Lebanese man who was killed in the New Year's Eve Istanbul nightclub attack, mourns over his coffin, at a church in Beirut, Lebanon, Jan. 3, 2017. Hussein Malla/AP Photo

Carnations left at the scene around photo of victims as people protest an attack at a popular nightclub in Istanbul, Jan. 3, 2017. An assailant believed to be armed with a long-barrelled weapon, opened fire at the nightclub in Istanbul's Ortakoy district during New Year's celebrations, killing dozens of people and wounding many others. Emrah Gurel/AP Photo

People react as they stand next to the coffin of Mohamed Elhot, one of the victims of the Reina night club attack, during his funeral ceremony, on Jan. 3, 2017, in Istanbul. Yasin Akgul/Getty Images

Friends and relatives mourn at the cemetary the death of Lian Nasser, an 18-year-old Arab Israeli woman who was one of the victims of an attack on a night club in Istanbul on New Year's Eve, during her funeral ceremony, on Jan. 3, 2017, in the Arab Israeli city of Tira, north of Tel Aviv. AFP/Getty Images

Relatives and friends of Elias Wardini, a Lebanese man who was killed in the New Year's Eve Istanbul nightclub attack, mourn over his coffin, at a church in Beirut, Lebanon, Jan. 3, 2017. The gunman killed 39 people, most of them foreigners, including three Lebanese citizens, at the Istanbul nightclub. The Islamic State group claimed the attack on Monday, saying a "soldier of the caliphate" had carried out the mass shooting in response to Turkish military operations against IS in northern Syria. Hussein Malla/AP Photo

Men inspect the coffins of Saudi victims who were killed in an attack on the Reina night club on New Year's eve in Istanbul, upon their arrival to the Jeddah international airport, on Jan. 2, 2017. Amer Hilabi/AFP/Getty Images

People pray as they stand next to the coffin of Mohamed Elhot, one of the victims of the Reina night club attack, during his funeral ceremony, on Jan. 3, 2017, in Istanbul. Yasin Akgul/AFP/Getty Images

People carry the coffin of Yunus Gormek, 23, one of the victims of the Reina night club attack, during his funeral ceremony, Jan. 2, 2017 in Istanbul. Bulent Kilic/AFP/Getty Images

Turkish President's top advisor Yalcin Topcu lays flowers along the barricade in front of the Reina nightclub, Jan. 2, 2017, in Istanbul. Yasin Akgul/AFP/Getty Images

The Brandenburg Gate in Berlin, Germany, is illuminated in the colors of the flag of Turkey, Jan. 2, 2017, the day after an assailant killed dozens of people in a crowded Istanbul nightclub during New Year's celebrations. Michael Sohn/AP Photo

A boy reacts at the funeral of Ayhan Arik, a victim of an attack by a gunman at Reina nightclub, in Istanbul, Turkey, Jan. 1, 2017. Osman Orsal/Reuters

Women who survived an attack by a gunman, react outside the Reina nightclub by the Bosphorus, in Istanbul, Turkey, Jan. 1, 2017. Huseyin Aldemir/Reuters

Forensic officers (unseen) work inside the Reina night club, an exclusive party spot in Istanbul, early on Jan. 1, 2017, after a gunmen went on a shooting rampage during New Year's Eve celebration. OZAN KOSE/AFP/Getty Images

People left red carnations as a floral tribute to the victims on the ground as Turkish riot police block further access to the Reina night club following a gun attack on the popular party spot in Istanbul, Turkey, Jan. 1, 2017. TOLGA BOZOGLU/EPA

Family members of victims of an attack at the Reina nightclub cry outside the Forensic Medical Center in Istanbul, Jan. 1, 2017. Suleyman Kaya/DHA - Depo Photos via AP

Relatives of Ayhan Arik, one of the victims of the Reina night club attack mourn during his funeral ceremony, Jan. 1, 2017 in Istanbul. OZAN KOSE/AFP/Getty Images

Flowers honoring the victims of the attack on the Reina nightclub are placed outside the club, the scene of a shooting attack, Jan. 1, 2017. Emrah Gurel/AP Photo

Medics carry a wounded person at the scene after an attack at a popular nightclub in Istanbul, early on Jan. 1, 2017. Istanbul Gov. Vasip Sahin said an armed assailant opened fire during a New Year's Eve celebration. IHA via AP

People leave as medics and security officials work at the scene after an attack at a popular nightclub in Istanbul, early on Jan. 1, 2017. IHA via AP