This incident was a mass shooting at Pulse, a gay nightclub in Orlando, Florida, United States, on June 12, 2016. Pulse was hosting a "Latin Night" event, and the majority of the victims were of Latin descent. This massacre resulted in 49 deaths and 58 injuries.

Omar Mateen (Perpetrator):

Born in New York to Afghan-American parents, his family moved to Florida during his childhood. In Florida, he showed an interest in violence and exhibited behavioral problems at school (including poor academic performance and repeated suspensions). As an adult, he held several jobs and experienced a failed marriage before ultimately becoming an armed security guard for G4S. Prior to the shooting, he had been investigated by the FBI in 2013 and 2014 for ties to terrorism. During this period, he was placed on a terrorist watchlist but was later removed. During the shooting, Mateen called 911, identifying himself as a "mujahid" (holy warrior), an "Islamic soldier," and a "soldier of God," repeatedly pledging allegiance to Abu Bakr al-Baghdadi, then leader of the extremist group Islamic State. He stated that the shooting was "triggered" by the killing of IS commander Abu Wahib in an airstrike in Iraq six weeks prior.

https://grokipedia.com/page/Pulse_nightclub_shooting