According to law enforcement officials, at an unknown time before the shooting, Mateen called the police and pledged himself to the leader of ISIS.[5][2]
At about 2:00 a.m. EDT, Mateen fired shots inside the nightclub. He was armed with a rifle, a handgun, and a "device".[4] Mateen then left the club briefly and exchanged gunfire with a police officer outside,[6] before returning inside to take hostages. Pulse posted on its Facebook page at 2:09 EDT, saying "Everyone get out of Pulse and keep running".[7]
↑Kelly, Erin. "Trump, Clinton, congressional leaders react to Orlando shooting". ABC 13 News Now. USA Today. Retrieved 12 June 2016. House Homeland Security Chairman Michael McCaul, R-Texas, said "this appears to be the worst terrorist attack on American soil since 9/11."