From: LVMPD Prelimary Investigative Report, 1 October / Mass Casualty Shooting, 01/18/18, pages 32-35

Detective Balonek, who was on Mandalay Bay Drive east of Las Vegas Boulevard, believed the gunfire was coming from inside the Las Vegas Village, or from an elevated position. He retrieved his binoculars from his vehicle and scanned the north facing tower of Mandalay Bay. Approximately three-quarters of the way up the tower on the north end, Detective Balonek observed a silhouette of a male standing in a shooting position several feet back from a window. Detective Balonek could see the smoke from the male shooting, however, no muzzle flashes were observed. Detective Balonek could not get on the radio so he switched to the Northeast Area Command channel and broadcasted the shooters location.