Orlando nightclub massacre: Who is gunman Omar Mateen?

Omar Mateen, of Port St. Lucie, Florida, has been identified as the gunman who opened fire at a nightclub in Orlando. Forty-nine people were…

50 dead in Florida nightclub shooting, worst in US history

The attack at an Orlando, Fla. nightclub left at least 50 people dead, making it the worst mass shooting in American history.