In the early hours of June 12 , 2016 , 49 people were killed and 53 were injured in a mass shooting at the Pulse nightclub in Orlando , Florida . The perpetrator , 29-year-old Omar Mateen , was a security guard and person of interest to the FBI in 2013 and 2014 . At the time , this event was the deadliest mass shooting in United States history by a single gunman , later eclipsed by the 2017 Las Vegas shooting . Additionally , it was the deadliest confirmed terrorist attack on U.S. soil since the 9/11 attacks and the deadliest attack against LGBT people in U.S. history
9/11 attacks
September 11 attacks
Domestic terrorism in the United States