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The Orlando Police Department released this photo of Omar Mateen, the person identified as the shooter in the Orlando terror attack.
The Orlando Police Department released this photo of Omar Mateen, the person identified as the shooter in the Orlando terror attack.

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    Officials: FBI had investigated Orlando gunman

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Officials: FBI had investigated Orlando gunman

An American-born man who'd pledged allegiance to ISIS gunned down 50 people at a gay nightclub in Orlando -- the deadliest mass shooting in the U.S., authorities said.

Officials: FBI had investigated Orlando gunman

An American-born man who'd pledged allegiance to ISIS gunned down 50 people at a gay nightclub in Orlando -- the deadliest mass shooting in the U.S., authorities said.