DESCRIPTION
Mateen was a ‘known quantity’ to federal law enforcement before he killed 53 people in the worst mass shooting in U.S. history.
Omar Mateen of Port Saint Lucie, Florida, came to the attention of federal authorities twice prior to being identified as the gunman in the Orlando nightclub mass shooting, a senior law enforcement source told The Daily Beast.
Mateen killed 53 people and shot more than 100 in total at the Pulse gay nightclub early Sunday morning, in the deadliest mass shooting in modern American history.
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