1 Omar Saddiqui Mateen burst into the club at 2.02am local time armed with an AR-15 assault rifle, a handgun, and a device police originally feared was a bomb.
2 He fired off rounds, leaving 39 people dead inside.
3 Emerging, he was confronted by a police officer who was working an extra shift, and exchanged fire. The officer drew the gunman outside on to Orange Avenue.
4 Mateen turned back inside, barricading himself indoors and making those still alive his prisoners.
5 Between five and eight people were in the room with him. A further 25 were trapped indoors.