"I can tell you that first responder resources were on the scene very, very quickly", McMahill said.
Sheriff Joe Lombardo again expressed frustration with the pace of the investigation, but not with the investigators who have yet to pinpoint the motive behind the shooter's decision to fire from the 32nd floor of the Mandalay Bay hotel casino on a Las Vegas Strip concert crowd of 22,000 on October 1.
The new timeline of events has risen questions about the police response to the deadliest mass shooting in modern US history.
In that time, Paddock was able to kill 58 people and wound almost 500 others in the worst mass shooting in modern us history.
According to the paper, Clark County Assistant Sheriff Tom Roberts told the paper that Mandalay security guard Jesus Campos alerted hotel officials of suspicious activity six minutes before Paddock opened fire at 10:05 p.m.
The investigation continues into why Paddock, a wealthy high-rolling gambler, shot at the crowd, wounding more than 500 people.
Silva was shot while helping people climb over a barricade.
Clark County Sheriff Joe Lombardo said on Monday that Stephen Paddock shot and wounded a Mandalay Bay security guard outside his door and sprayed 200 bullets down the hall six minutes before shooting at the concert-goers. "We can not be certain about the most recent timeline ... and we believe what is now being expressed may not be accurate", MGM spokeswoman Debra DeShong said.
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The Pentagon did not immediately respond to The Independent's request for comment. A coalition spokesperson dismissed the allegations as false.
Lombardo also said the shooting stopped 10 minutes later, at 10:15 p.m.
On Tuesday, Las Vegas Metro Police Undersheriff Kevin McMahill explained more about Campos's actions the night of the shooting, helping fill in some of what happened ahead of the attack.
Paddock had power tools and was attempting to drill a hole in an adjacent wall, perhaps to mount another camera or to point a rifle through, but he never completed the work, Lombardo said. "The fact the security guard did what he did, when he did it, shortened the amount of time that he was going to be shooting on the crowd, in my opinion". Lombardo declined to reveal what they've said, but he stated, "Every piece of information we get is one more piece of the puzzle". "It's because this individual purposely hid his actions leading up to this event and it is hard for us to find the answers to those actions". "If he yelled a second too late, I would have been shot".
The FBI is working around-the-clock and a "comprehensive picture is being drawn as to the suspect's mental state", the sheriff said.
"We just don't know how long it took him to call".
"Currently, we do not believe there is one particular event in the suspect's life for us to key on", the sheriff said.
Lombardo said investigators are making progress daily, and that doctors began Paddock's autopsy on Tuesday but have not noted any brain abnormalities. After identifying their items, some smiled and others hugged the Federal Bureau of Investigation agents or Red Cross volunteers who had helped them. "I want to help them understand what they're seeing", Eric Paddock told the Las Vegas Review-Journal.
Lombardo said on Monday that law enforcement is also talking to Marilou Danley, the shooter's girlfriend. Roberts didn't know exactly what time Campos called in his own shooting before the gunman's assault on the show began, or if the hotel immediately shared that information with police.