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Suspected Islamic extremist opened fire inside Pulse gay club in Orlando in the early hours of this morning
Law enforcement sources have identified the shooter as US citizen Omar Mateen, from Port St. Lucie in Florida
He shot more than 40 people - killing about 20 - and took party-goers hostage before being killed by police
Shooter, believed to be in his 20s, was carrying a suspicious device, possibly a suicide vest, when he attacked
Police used an explosive device to distract the gunman and rescue around 30 people who had been taken hostage
Police engaged in gunfire with the man and an officer was shot in the head, but he was saved by his helmet
FBI says gunman may have 'leanings to radical Islamic terrorism' and it is being investigated as 'an act of terrorism'
Took place four miles from where The Voice singer Christina Grimmie, 22, was shot dead at The Plaza Live on Friday