VIDEO

A police bodycam captured the moment officers entered Pulse and worked to secure the area.

The massacre's perpetrator, Omar Mateen, 29, from Port St. Lucie in Florida, opened fire in the early hours of Sunday, June 12, killing 49 people and injuring 53 others.

He entered the nightclub wielding an AR-15 assault rifle and a handgun and at around 2 am he exchanged gunfire with an officer working at the club before heading back inside and taking hostages.

He was eventually shot and killed by Orlando police after a three-hour standoff.

The incident was the deadliest terrorist attack in the U.S. since the September 11, 2001 attacks.