The gunman who slaughtered at least 50 people inside a gay club in Orlando called 911 and swore allegiance to the leader of Islamic State shortly before the massacre, according to law enforcement officials.
Shooter Omar Mateen, 29, from Port St. Lucie in Florida, opened fire at Pulse night club in the early hours of this morning.
At least 50 people were killed and 53 others were injured in the shooting in the deadliest mass shooting in US history. A surgeon at Orlando Regional Medical Center said the death toll was likely to climb.
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