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This handout video grab taken from CCTV and released on January 2, 2017 by Haber Turk Gazete newspaper shows an gunman carrying out an attack on the Reina nightclub, on the bank of the Bosphorus, in Istanbul on January 1, 2017.   
The Islamic State group on January 2, 2017 claimed responsibility for an attack on a nightclub in the Turkish city of Istanbul that killed 39 people on New Year's Eve. In a statement circulated on social media, the jihadist group said one of the "soldiers of the caliphate" had carried out the attack on the Reina nightclub, on the bank of the Bosphorus.
 / AFP PHOTO / HABER TURK GAZETE / STRINGER / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / CCTV / STRINGER" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

STRINGER/AFP/Getty Images
This handout video grab taken from CCTV and released on January 2, 2017 by Haber Turk Gazete newspaper shows an gunman carrying out an attack on the Reina nightclub, on the bank of the Bosphorus, in Istanbul on January 1, 2017.   
The Islamic State group on January 2, 2017 claimed responsibility for an attack on a nightclub in the Turkish city of Istanbul that killed 39 people on New Year's Eve. In a statement circulated on social media, the jihadist group said one of the "soldiers of the caliphate" had carried out the attack on the Reina nightclub, on the bank of the Bosphorus.
 / AFP PHOTO / HABER TURK GAZETE / STRINGER / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / CCTV / STRINGER" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS

STRINGER/AFP/Getty Images

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Turkish Media: Istanbul suspect arrested

Authorities have captured the man who allegedly is behind the bloody Istanbul New Year's Reina nightclub massacre. CNN's Ian Lee reports

Turkish Media: Istanbul suspect arrested

Authorities have captured the man who allegedly is behind the bloody Istanbul New Year's Reina nightclub massacre. CNN's Ian Lee reports