Forty-nine people are dead and at least 53 injured in the deadliest shooting in American history after Omar Mateen, a 29-year-old U.S. citizen, opened fire and took hostages inside the Pulse gay nightclub in Orlando, Fla.

What we know:

Orlando gunman identified as Omar Mateen

The gunman has been preliminarily identified as 29-year-old Omar Mateen, a U.S. law enforcement official said.

The gunman -- who investigators said may have had radical Islamic leanings -- was killed by a SWAT team after taking hostages at Pulse.

The "lone wolf" gunman was armed with an assault rifle, a handgun and an unspecified "device," said Orlando-area officials, who did not elaborate on why they suspected he may have been a radical Islamist.

"It appears he was organized and well-prepared," Orlando Police Chief John Mina said, adding that the gunman was not from the Orlando area.

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