Could Vegas police have taken down the gunman sooner?

Flowers, candles and other items surround the famous Las Vegas sign at a makeshift memorial for victims of a mass shooting Monday, Oct. 9, 2017, in Las Vegas. Stephen Paddock opened fire on an outdoor country music concert killing dozens and injuring hundreds. (AP Photo/John Locher)
FILE - In this Oct. 3, 2017, file photo, investigators work among thousands of personal items at a festival grounds across the street from the Mandalay Bay Resort and Casino in Las Vegas. Friends and relatives of the victims and other concert-goers who survived returned Monday, Oct. 9, 2017, to reclaim baby strollers, shoes, phones, backpacks and purses left behind in the panic as they fled, at a Family Assistance Center at the Las Vegas Convention Center. (AP Photo/Marcio Jose Sanchez, File)
Clark County Sheriff Joe Lombardo, left, with Aaron C. Rouse, special agent in charge for the FBI in Nevada, discusses the Route 91 Harvest festival mass shooting at the Las Vegas Metropolitan Police Department headquarters in Las Vegas, Monday, Oct. 9, 2017. Law enforcement authorities on Monday made a significant change to the timeline of the mass shooting, saying the gunman shot a hotel security guard before he opened fire on concertgoers. (Erik Verduzco/Las Vegas Review-Journal via AP)

The revised timeline given by investigators for the Las Vegas massacre raises questions about whether better communication might have allowed police to respond more quickly and take out the gunman before he could kill and wound so many people.

On Monday, Sheriff Joe Lombardo said Stephen Paddock shot and wounded a Mandalay Bay hotel security guard outside his door and sprayed 200 bullets down the hall six minutes before he opened fire Oct. 1 from his high-rise suite on a crowd at a country music festival below.

That was a different account from the one police gave last week: that Paddock shot the unarmed guard, Jesus Campos, after unleashing his barrage of fire on the crowd, where 58 people were killed and hundreds injured.

Late Tuesday, a spokeswoman for Mandalay Bay questioned the latest timeline of events provided by police.

"We cannot be certain about the most recent timeline that has been communicated publically (sic), and we believe what is currently being expressed may not be accurate," said Debra DeShong, a spokeswoman for MGM Resorts International, which owns the Mandalay Bay hotel casino.

The sheriff had previously hailed Campos as a "hero" whose arrival in the hallway may have led Paddock to stop firing. But on Monday, Lombardo said he didn't know what prompted Paddock to end the gunfire and take his own life.

How crucial were the minutes that elapsed before the massacre began?

"This changes everything," said Joseph Giacalone, a professor at John Jay College of Criminal Justice and a former New York City police sergeant. "There absolutely was an opportunity in that timeframe that some of this could've been mitigated."

Giacalone added: "By engaging the shooter ahead of time during this event, it could've saved a lot of heartache."

Campos reported to hotel security dispatchers that he was shot before Paddock opened fire on the crowd, Assistant Sheriff Tom Roberts told The Los Angeles Times. Campos ran down the hall, away from Paddock's room, after he was shot and may have used both his radio and a hallway phone to call for help, he said.

It wasn't clear exactly what time Campos called for help or if the hotel had relayed the information about the shooting to police. Las Vegas police did not respond to questions from The Associated Press about whether hotel security or anyone else in the hotel called 911 to report the hallway shooting.

A representative for Campos' union didn't immediately respond to a message seeking comment.

"Our officers got there as fast as they possibly could and they did what they were trained to do," another Las Vegas assistant sheriff, Todd Fasulo, said Tuesday.

But the sheriff has said that Las Vegas police officers searching the hotel for the gunman during the attack did not learn the guard had been shot until they got off the elevator on the 32nd floor and met him in the hallway.

Nicole Rapp, whose mother was knocked to the ground and trampled by panicked concertgoers as bullets rained from above, said she's "having a hard time wrapping my head around" why police changed the timeline of the shooting.

"It's very confusing to me that they are just discovering this a week later," she said. "How did we not know this before? It's traumatic for the victims and their families not to be sure of what happened."

Fasulo explained the change in the timeline by saying that dozens of investigators have been using different sources of information — including surveillance video, computers, police body cameras, cellphones and interviews — and that not all clocks were in sync.

Last week, police said Paddock had shot at concertgoers for 10 minutes and stopped firing around 10:15 p.m. The first officers arrived on the 32nd floor at 10:17 p.m. and encountered the wounded guard at the elevator bank about a minute later, police said.

The security guard had been responding to a door alarm on the floor when he heard an odd drilling sound, Undersheriff Kevin McMahill told KNPR on Tuesday. That was when Paddock fired hundreds of rounds at the guard and a maintenance man, McMahill said.

Paddock had power tools and was trying to drill a hole in a wall, perhaps to mount another of the security cameras he set up around him, or to point a rifle through, but he never completed the work, Lombardo said. He also drilled holes and bolted a metal bar to try to prevent the opening of an emergency exit door near his room.

The six minutes that transpired between the hallway shooting and the start of the gunman's fusillade wouldn't have been enough time for officers to stop the attack, said Ron Hosko, a former FBI assistant director who has worked on SWAT teams. Rather than rush in without a game plan, police would have been formulating the best response to the barricaded gunman, he said.

"Maybe that's enough time to get the first patrolman onto the floor but the first patrolman is not going to go knock on that customer's door and say 'What's going on with 200 holes in the door?'" Hosko said.

McMahill defended the hotel and said the encounter that night between Paddock and the security guard and maintenance man disrupted the gunman's plans. Paddock fired more than 1,000 shots and had more than 1,000 rounds left in his room, the undersheriff said.

"I can tell you I'm confident that he was not able to fully execute his heinous plan and it certainly had everything to do with being disrupted," McMahill said. He added: "I don't think the hotel dropped the ball."

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Associated Press writers Ken Ritter and Sally Ho in Las Vegas, Anita Snow in Phoenix and Sadie Gurman in Washington contributed to this report.

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For complete coverage of the Las Vegas shooting, click here: https://apnews.com/tag/LasVegasmassshooting .

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