There were 75 minutes between the first shot being fired by Las Vegas gunman Stephen Paddock and police entering his room at the Mandalay Bay hotel.
Las Vegas Metropolitan Police Department Sheriff Joseph Lombardo has given a press conference where he explained what happened during that time as police responded to the attack that claimed the lives of 59 people, including the gunman.
This is the official timeline of the police response
10:05pm: First shots fired by the suspect
10:12pm: First officers arrived on the 31st floor and announced gunfire coming from above them
10:15pm: Last shots fired by the suspect
10:17pm: First two officers arrive on the 32nd floor of the hotel, where Paddock's room was
10:18pm: Security officer tells the officers he was shot and gives the exact location of the suspect's room
10:26-10:30pm: Eight additional officers arrive on the 32nd floor and begin to move systematically down the hallway, clearing each room and looking for injured people
10:55pm: Eight officers arrive at the stairwell in the opposite ends of the hallway nearest the suspect's room
11:20pm: The first breach was off and officers entered the suspect's room, where he was seen lying on the ground
Police waited to enter Paddock's room because gunfire had already stopped
Sheriff Lombardo said it was "phenomenal" officers were able to reach the 32nd floor within 12 minutes of the first shot being fired.
But by the time officers had arrived and confirmed the location of the suspect's room, the gunfire had stopped.
"Because no firing was occurring, they could not hear additional firing, they believed it was important to evacuate [hotel rooms] in case the suspect was barricaded," Sherriff Lombardo said.
He says in accordance with their training, officers retrieved a master keycard and began to systematically clear each hotel room.
He says while the first strike team did this, a second team — made up of two canine personnel, a SWAT officer and patrol officers — tried to get closer to Paddock's room.
"They attempted to secure the front doorway of the suspect's room but, as they entered into the hallway, they could see the room service cart, and readily apparent on the room service cart were cameras," he said.
That's why they pulled back and waited for the approach of a full SWAT team.
"Keep in mind this delay was not undue. It was purposeful and no shots were being heard by the suspect at this point," Sheriff Lombardo said.
Police believe the gunfire stopped when a security officer approached Paddock's hotel room
Sheriff Lombardo says his assumption was that Paddock was able observe the security officer outside his hotel room and was in fear he was "about to be breached".
"He was doing everything possible to figure out how he could escape at that point," he said.
The officer was then shot in the leg through the door.
"The bravery was amazing because he remained with our officers, providing them the key pass to access the door and actually continued to help them clear rooms until our officer demanded that he go seek medical attention," Sheriff Lombardo said.
However, he says it's likely the gunfire would have stopped around the same time even if the security officer hadn't approached Paddock's door, because police would have arrived there "maybe 60 seconds" afterwards.
It's unknown when exactly Paddock shot himself
Police say two possibilities are that it could have been when the hotel room door was breached with explosives or when a strike team was setting up in the hallway.