The deadliest shooting in recent US history unfolded — as most do — in a storm of chaos and confusion.
Though the enormity of the situation emerged quickly Sunday night, details were still emerging of exactly what happened more than 24 hours later.
The police have confirmed that the gunman, identified as a 64-year-old man named Stephen Paddock, spent three days in Las Vegas before his attack and managed to amass a huge stockpile of guns.
By the time the general public had been told a shooting was underway Sunday night, Paddock was already dead. Here, moment by moment, is how the attack unfolded:
September 28, 2017: Stephen Paddock checks into the Mandalay Bay Casino on the south Las Vegas strip.
Paddock booked a two-room suite on the 32nd floor, with a clear view over the Route 91 Harvest festival taking place the other side of South Las Vegas Boulevard.
He arrived on Thursday, the day before the festival started. He launched his attack on Sunday evening, in the final moments of the concert.
Paddock transports huge quantities of weapons and ammunition into his room.
Las Vegas police say they found a total of 23 guns and thousands of rounds of ammunition in his room.
Nevada gun laws are among the most permissive in the United States, but Mandalay Bay itself says firearms are “strictly prohibited” on its premises.
At a press conference after the shooting, Las Vegas Metropolitan Police Department Sheriff Joseph Lombardo said Paddock brought “in excess of 10” suitcases up to his room.
Paddock’s movements between checking in on Thursday and opening fire on Sunday night are so far unclear.
Sunday, 9.40 p.m.: Route 91 Harvest festival begins its closing act.
10.08 p.m., October 1: Paddock opens fire.
Using automatic weapons, Paddock rained bullets on the crowd of 22,000 people below him.
The first official word appears to have been an officer using police radio to alert his colleague. According to Reuters, a voice could be heard saying: “We got shots fired! It sounded like an automatic firearm.”
Twenty-four hours after the shooting, the death toll stands at 59, with more than 500 people injured.
10:13 p.m.: Police realise where the shots are coming from.
Citing police radio transmissions, the New York Times said police started to zero in on the upper floors of Mandalay Bay around five minutes after the shooting began.
Here are two lines where officers realise what is happening, both time-stamped 10:13 p.m.:
“It’s coming from like the 50th or 60th floor, north of the Mandalay Bay! It’s coming out a window.
“We’re seeing local flashes in the middle of Mandalay Bay on the north side, kind of on the west tower but towards the center of the casino, like one of the middle floors.”
Officers begin to search the hotel.