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Turkish police officers stand guard outside a nightclub, which was attacked by a gunman overnight, in Istanbul, on New Year's Day, Sunday, Jan. 1, 2017. An assailant believed to have been dressed in a Santa Claus costume and 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 dozens of others in what the province's governor described as a terror attack. (AP Photo/Emrah Gurel)
Turkish police officers stand guard outside a nightclub, which was attacked by a gunman overnight, in Istanbul, on New Year's Day, Sunday, Jan. 1, 2017. An assailant believed to have been dressed in a Santa Claus costume and 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 dozens of others in what the province's governor described as a terror attack. (AP Photo/Emrah Gurel)

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    Turkey vows to find nightclub shooter

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Turkey vows to find nightclub shooter

Turkish authorities promise to find the shooter who killed dozens at an Istanbul nightclub where many were celebrating the new year. CNN's Ian Lee reports.

Turkey vows to find nightclub shooter

Turkish authorities promise to find the shooter who killed dozens at an Istanbul nightclub where many were celebrating the new year. CNN's Ian Lee reports.