Orlando killer appears to have been `homegrown extremist'

ORLANDO, Fla. (AP) -- The gunman whose attack on a gay nightclub left 49 victims dead appears to have been a "homegrown extremist" who espoused support for a jumble of often-conflicting Islamic radical groups, the White House and the FBI said Monday. As Orlando mourned its dead with flowers, candles and vigils, counterterrorism investigators dug into the background of 29-year-old Omar Mateen for clues to why the American-born Muslim carried out the deadliest mass shooting in modern U.S. history