Via Daily Beast: Omar Mateen of Port Saint Lucie, Florida, who has been identified as the gunman who killed 53 people at a gay nightclub in Orlando, Florida. The attack is the deadliest mass shooting in modern American history, with more than 100 people shot. Mateen came to the attention of federal authorities twice prior … Continue reading FBI Had Previously Investigated Omar Mateen As ‘Person Of Interest’, But Closed Case…