"Looks like it might be a camera of some sort", the officer can be heard saying.
"I see a guy switching guns, not reloading", another officer is heard saying in the video as the team examines Paddock's room. The clips don't provide a motive for the rampage.
"Did he have any scoped weapons over there?" an officer asked.
Las Vegas police released body camera footage on Wednesday showing officers entering Stephen Paddock's 32nd-floor hotel suite on October 1, 2017, about an hour after he opened fire on thousands of concertgoers, leaving 58 people dead and hundreds wounded.
Near his head there is a pool of blood on the carpet as a police SWAT officer walks past.
"Rifles up, move up", an officer said.
Officer body-camera video from the deadliest mass shooting in modern USA history shows Las Vegas police walking into a casino that's still packed and telling people to get inside and lock the doors. The video shows officers moving cautiously down the halls of the hotel, trying desperately to find the gunman. "He's shot and killed multiple people already".
He referred to a preliminary police report released January 19 that said Paddock meticulously planned the attack, researched police SWAT tactics, rented hotel rooms overlooking outdoor concerts and investigated potential targets in at least four USA cities. "Get everyone out of here". The area appears dark, with part of one room lit only by Paddock's laptop, as the fire alarm flashes and sounds.
The video shows officers checking rooms in the Mandalay Bay before getting to Paddock's suite.More news: It's Sidda-rupaiah in Karnataka: PM Modi
The videos record officers talking about whether there is evidence of a second shooter and finding Paddock's driver's licence. The shooting is considered one of the deadliest mass shootings in modern American history. The Nevada Supreme Court ruled Friday that police should release the bodycam footage and 911 calls from the shooting.
Paddock, a 64-year-old wealthy retired accountant, amassed an arsenal of weapons including assault rifles in his hotel room and unleashed fury on the evening of October 1, 2017, firing more than 1,100 rounds.
Police say he killed 58 people and injured hundreds more before killing himself as authorities closed in. But the hustle and bustle of Las Vegas went on.
Washoe County records still list Paddock as the owner.
In a news briefing Tuesday, Lombardo cited cost, allocation of resources and further victimization of those affected by the shooting as reasons for delaying the release of the footage, recordings and documents.
The footage does not show what the first officer through the door saw because he didn't activate his body-worn camera.
Days after the attack, police published harrowing recordings captured by officers' body cameras that showed the horror unfolding outside as the gunfire began. A lawsuit by The Associated Press and other media prompted the videos' release.
Police were criticized about their response when a timeline suggested there had been a six-minute delay between Paddock shooting a security guard and the gunman opening fire on the crowds below his hotel suite.
The agency requires officers with body cameras to activate them during calls that lead to interaction with residents and searches.