The shooter responsible for a mass shooting that is being investigated as an act of terrorism has been identified as Omar Mateen of Port St. Lucie, Florida. Mateen s father was contacted by MSNBC, where he spoke out against the mass shooting that took 50 people s lives at Pulse, a gay nightclub located in Orlando, late Saturday night. The extremely high death toll makes this incident the largest mass shooting in United States history. There are dozens of people who have been hospitalized with injuries, experts have said that they expect to see the death toll increase over time.It has been confirmed that the shooter used both a handgun and an  AR15 type rifle. Mayor Dyer: 50 dead in Pulse nightclub shooting. @ChiefJohnMina Suspect had handgun and AR15 type rifle.  Orlando Police (@OrlandoPolice) June 12, 2016 We are saying we are apologizing for the whole incident. We weren t aware of any accident he is taking. We are in shock like the whole country. This had nothing to do with religion. The father of the shooter says that he saw his son become  angry when he saw two men kissing in downtown Miami a couple months ago. Here is the MSNBC report on the story:WATCH: Father of shooter in Orlando club tells NBC News:  We are apologizing for the whole incident https://t.co/SJiy3pFAYJ  TODAY (@TODAYshow) June 12, 2016So far a motive for the shooting has not been released by investigators. Investigators have not yet determined whether the shooting is an act of domestic terrorism or whether Marteen was acting in collusion with an international terrorist organization.Fatriana Evans was outside of Pulse when the shooting began. She told the Associated Press: Some guy walked in and started shooting everybody. He had an automatic rifle, so nobody stood a chance. I just tried to get out of there. Featured image from Gerardo Mora/Getty Images