The massacre - the worst mass shooting in the history of the United States - began when the gunman stormed the Pulse Nightclub about 2 a.m.
The shooter, identified by several law enforcement sources as Omar Mateen, 29, was killed in a shootout with law enforcement after a three-hour siege. At least 50 people were killed and more than 50 others were wounded when a gunman opened fire and took hostages at a gay nightclub in Orlando, Florida, early Sunday morning.
