Here’s a timeline of the Las Vegas shooting — with the crucial detail police left out last time

Reporting from Las Vegas —  Las Vegas police revealed Monday that a hotel security guard was shot in the hallway outside gunman Stephen Paddock’s room six minutes before Paddock opened fire on a crowd of concertgoers.

Here is the revised timeline of the incident, as police now understand it:

9:59 p.m.: Hotel security guard is shot by Paddock on the 32nd floor of the Mandalay Bay Resort and Casino.

10:05 p.m.: First shots fired on music festival. This was seen on closed-circuit television from the concert venue.

10:12 p.m.: First two officers arrive on the 31st floor and announce that the gunfire is coming from directly above them.

10:15 p.m.: The last shots are fired by Paddock.

10:17 p.m.: The first two officers arrive on the 32nd floor.

10:18 p.m.: Security officer tells police he was shot and gives location of the gunman’s room.

10:26-10:30 p.m.: Eight additional officers arrive on the 32nd floor and begin to move down the hallway, clearing every room and looking for any injured people. They no longer hear gunfire.

10:55 p.m.: Eight officers arrive in the stairwell at the opposite end of the hallway nearest to Paddock’s room.

11:20 p.m.: Officers enter the room. They see Paddock on the ground and a second door that could not be accessed from their position.

11:27 p.m.: A second breach is set off, allowing officers to enter the second room. Officers quickly realize there is no one else in the rooms and announce over the radio that the suspect is down.