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By Tracy Connor and Erik Ortiz The gunman who opened fire at a gay Florida nightclub early Sunday, shooting over 100 people, had called 911 moments before to pledge allegiance to the leader of ISIS, law enforcement sources told NBC News. But as investigators try to determine if extremism motivated Omar Mateen, 29, to attack the Pulse Nightclub in Orlando, his family believes he was pushed over the edge by pure hate against the LGBT community. Various law enforcement officials have identified the shooter as Mateen, who was born in New York and lived in Port St. Lucie on Florida's eastern shores. The attack, which claimed at least 50 lives, is considered the deadliest mass shooting in U.S. history. While authorities are still investigating what motivated the gunman, the shooting is being considered an act of terrorism. Mateen, who was carrying a handgun and AR-15-type rifle, died after a SWAT team stormed the club, police said. The shooter, who worked in security, according to the fa

VIDEO: Death Toll from Florida Mass Shooting Rises to 50, 53 Wounded The death toll from a mass murder at a night club in Orlando, Florida, has reached to 50 people, the worst mass shooting in US history. About 53 other people were injured in the shooting, which took place in the Pulse Club on Sunday morning. The gunman took hostages at the club and barricaded himself in the complex but was later killed by police. "It appears he was organized and well-prepared," Orlando Police Chief John Mina said, adding that the assailant had an assault-type weapon and a handgun. Authorities described the attack as a domestic act of terrorism. The Federal Bureau of Investigation (FBI) is also involved in the case. A paramedic said the casualties will rise as more people are being brought out of the club. A man who had been inside the club earlier described a situation of chaos outside as the number of casualties became apparent. “There were just bodies everywhere,” he said. “In the

VDO: Who is ISIS Terrorist who Do the Worst Mass Shooting in US History? Terrorist Omar Mateen shot dead 50 people and wounded at least 53 more during the massacre at the Pulse nightclub in Orlando in the early hours of Sunday morning – and just before the attack to pledge allegiance to ISIS (Islamic State , ISIL , IS and Daesh). Mateen, 29, of Port St. Lucie in Florida, reportedly laughed as he sprayed bullets into the crowded club before he was shot dead by a SWAT team several hours after launching his horrific massacre with a legally bought assault rifle and pistol. Hero officers used a 'controlled explosion' to distract the shooter before fatally shooting him and were able to rescue about 30 hostages who were hiding in the bathroom of the club. During the gunfire, an officer was shot, but he was saved by his helmet (pictured) Caught on film: The dramatic moment a police swat team abseil in to save a suicidal man from jumping to his death Alt