ISTANBUL NIGHTCLUB ATTACK
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Warning, graphic content — Security camera footage shows gunman, dressed in a Santa suit, in Istanbul nightclub attack - DHA
http://haber.dha.com.tr/newpics/news/010120170241289033828.mp4
That does not look like a Santa suit.
It looked like he was removing an outer jacket or covering. Perhaps that was some kind of Santa looking outfit. That would give him cover to go into the club (looks like a party guy, having fun in a Santa suit) then remove it and hope to get away? Very sad.