The massacre at an Orlando gay nightclub early this morning has been described as a "domestic terror incident," with at least 50 dead and 53 injured, officials said, making it the worst mass shooting in U.S. history and the deadliest terror attack on U.S. soil since the events of Sept. 11, 2001.
The shooter has been identified by officials as Omar Mateen of St. Lucie County, Florida, a U.S.-born citizen with Afghani parents. After the shooting began, he called 911 to pledge his allegiance to ISIS, according to law enforcement officials.