On June 12, 2016, a man calling 9-1-1 claimed responsibility for the shooting spree that had begun inside the Pulse nightclub, but the police had no way of knowing if that was true.
“The caller, later identified as Omar Mateen, repeatedly hung up on the Orlando police negotiator who had to call him back more than a dozen times.
From about 3:15 a.m. to about 3:20 a.m., officers could be heard in the background trying to pinpoint where Mateen might be. The background noise was “sterile,” said one officer, as if he were in an office. Or a bathroom, said another.
“I’m still not convinced this guy’s in there,” the negotiator said as Mateen’s phone rang. Law enforcement officers were going to Mateen’s address in Fort Pierce to check whether he was home, and Orlando police pinged his cellphone to establish his location.
Despite his misgivings, the negotiator, who identified himself as Andy, treated Mateen seriously when they talked.
He spoke calmly but with a sense of urgency as he tried to pry information from Mateen: where in the club he was, whether there were injured people with him, whether he had explosives or accomplices, what would get him to surrender.”
read the full story here and listen to the audio: http://www.orlandosentinel.com/news/pulse-orlando-nightclub-shooting/os-omar-mateen-pulse-911-calls-20161031-story.html