Orlando gunman said anti-Muslim taunts led him to boast of terror links

Letter by Omar Mateen, who went on to kill dozens in nightclub shooting, said co-workers ganged up on him and called him a 'potential terrorist' The gunman who opened fire at a Florida nightclub last month had complained he was repeatedly taunted for being Muslim in his job as a Florida courthouse guard, according to records released on Monday. Related: Orlando attack victims: the lives cut short in America's deadliest shooting