Worst mass shooter in U.S. history - NYC-born 'Islamic extremist' Omar Mateen, 29, who shot dead 50 and injured 53 in Orlando gay club massacre was homophobe 'who got angry when he saw two men kissing'

Attack: A woman sits on the ground outside the club while another party-goer, whose legs are covered in blood, stands beside her

• 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 killed at least 50 people, injured 53 and took party-goers hostage before being shot dead by police
• Shooter, 29, was carrying a suspicious device, possibly a suicide vest, when he began shooting in the nightclub
• 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