WATCH: Las Vegas police storm mass shooter Stephen Pollock's hotel room

The Las Vegas Metropolitan Police Department on Wednesday released the first body-worn camera video footage of the largest mass shooting in American history.

The footage shows officers entering the 32nd floor of the Mandalay Bay hotel on the Strip, and into the room that Stephen Paddock had occupied as he open fired from the window onto a crowd of hundreds attending an outdoor concert across the street. The videos from the Oct. 1 shooting came from the body cameras of police officers Joshua Bitsko and David Newton as they climbed the building’s stairs, asked patrons to leave the hotel, and approached the gunman’s suite. He'd already killed 58 people and injured hundreds more.

At one point, an officer says, “Breach. Breach. Breach,” as they forced their way into the shooter’s room.

An explosion goes off, the hotel alarm blares, and a recorded voice alerts guests. The officers pass a dining cart with cameras on it, allegedly so that Paddock could see if anyone was approaching, and enter the dark room. They see Paddock, 52, dead in a pool of his own blood, surrounded by darkness, due to all of the blinds being shut. Large guns are strewn around the room.

“Watch these closets. Watch your back,” an officer says.

The LVMPD didn’t immediately release the footage, and attempted to argue against multiple news organizations in the Nevada Supreme Court that they never should. However, they failed to convince the court, and were ordered to turn over the footage.

On Tuesday, Sheriff Joe Lombardo told reporters that the videos, 911-call recordings, and documents could have a negative effect on victims.

“We believe the release of graphic footage will further traumatize a wounded community and for that we apologize,” Lombardo said as he announced that they would have to release the footage despite his concerns.

Wednesday’s release included about three hours of body camera footage — there are about 750 hours of footage total that still has to be released, the LA Times reported. Police officials said in a press release Tuesday that because of the volume of videos, 911 calls and documents, it will take months for all of it to become public.

But despite the new footage and an extensive investigation, the gunman’s motive is still unclear. What we do know is that between 10:05 and 10:16 p.m. that Sunday, Paddock open fired onto the crowd from his suite on the 32nd floor. He shot more than 1,100 rounds over about 12 minutes, utilizing bump stocks to make his semi-automatic rifles fire like automatics. He also shot into the hallway, hitting Mandalay Bay security guard Jesus Campos in the leg. It took 40 minutes after the last shot was heard for LVMPD to make it into Paddock’s room. Police found over a dozen weapons, several hundred rounds of ammunition, and a hard drive filled with child pornography in the room.

Cover image: Photo released by the Las Vegas Metropolitan Police Department Force Investigation Team Report shows the interior of Las Vegas shooter Stephen Paddock's 32nd floor room of the Mandalay Bay hotel. (Las Vegas Metropolitan Police Department via AP, File)