While authorities begin the painstaking work into why gunman Omar Mateen massacred at least 50 people at a popular gay nightclub in Florida, they'll have a number of clues for understanding the mindset of the mass murderer.
A few key revelations about his past came to light hours after the 29-year-old was identified as the shooter who took the Pulse nightclub in Orlando hostage early Sunday before he was killed by a SWAT team. Now, law enforcement are trying to determine whether terrorism, hate or both pushed him over ...
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