> Omar Mateen, a U.S.-born citizen, has been identified as the suspect in Sunday's mass shooting that left at least 20 dead and 42 wounded at Pulse Nightclub, a gay nightclub in Orlando, Florida.
Mateen's parents were born in Afghanistan, and he was "on the radar" of U.S. officials for some time, but was not the target of a specific investigation, law enforcement officials told ABC News.