Orlando Nightclub Shooting: Mass Casualties After Gunman Opens Fire

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.

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.

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. ET with an AR-15 type rifle and a handgun, officials said.

CLICK HERE - Tampa Bay Times - LIVE - BREAKING COVERAGE OF THE PULSE NIGHTCLUB SHOOTING IN ORLANDO, FLORIDA

CLICK HERE - NBC News

CLICK HERE - CNN - LIVE Blog

CLICK HERE - CNN - Timeline of Orlando nightclub shooting

CLICK HERE - The New York Times - Mass Shooting at Pulse Florida Nightclub: Live Updates

CLICK HERE - The Washington Post - Live updates: Orlando shooting

CLICK HERE - Reuters - Orlando Nightclub Shooting