police say there may have been as many as 500 people inside this nightclub in the center of istanbul s most crowded party districts. the dust appears to have largely settled on the crime scene and you re seeing some of the pictures of that here. but the killer remains at large. now how hard could it be to find a gunman dressed as santa claus? well, some of the cctv footage from the nightclub that surfaced on social media shows the man who is believed to be the killer quickly changing clothes. those images haven t been confirmed by nbc, but istanbul police are saying they believe the assailant did indeed change out of his santa costume to flee the scene. so the suspect is still at large and the subject of an expanding manhunt across turkey. there has been no claim of responsibility at this early hour, suspicion is likely to focus on islamic state, known as isis. but turkey sits in the middle of multiple geopolitical cross currents. it is surrnded by ees and as i mentioned, it haseen bat