On Monday, Sheriff Joe Lombardo said Stephen Paddock shot and wounded a Mandalay Bay hotel security guard outside his door and sprayed 200 shots down the hall six minutes before he opened fire October 1 from his high-rise suite on a crowd at a country music festival below.
Paddock began shooting at the festival crowd at 10.05 p.m., but Lombardo said that he is not assuming the encounter with Campos made Paddock - who had meticulously planned his attack - change his timeline.
Although Campos alerted hotel security, Lombardo said police were not aware of the incident until they stormed Paddock's room ten minutes later.
Paddock likely saw Campos on the security camera system he had set up, prompting him to fire at the security guard and ultimately shooting him in the leg, investigators said.
He had that written down and figured out so he would know where to shoot to hit his targets from there.
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Lombardo said they have no evidence to show there was a second shooter.
It is now clear that Stephen Paddock, who brought 23 firearms and thousands of rounds of ammunition into his suite at the Mandalay Bay Resort and Casino, possessed all of the signs of a deeply psychotic, angry, gun-crazed killer who needed no motive other than becoming the man who carried out the worst mass shooting in modern American history.
At the end of the press conference, Las Vegas Metropolitan Police Department spokeswoman Laura Meltzer said police believe Campos was able to notify his security dispatcher after he was shot.
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 are in sync.
Police initially said the guard interrupted Stephen Paddock as the attack was under way.
"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", Mr Lombardo said.
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The sheriff also said investigators do not believe that a single event pushed him to do what he did.
Lombardo made the clarification at a news conference Monday about the ongoing investigation into the shooting and the possible motives for Paddock's October 1. killing spree.
Authorities have not revealed why the two officers arrived to the 31st floor instead of the 32nd, and it is unclear if the injured officer contacted police or hotel security after he was shot.
"Before we were trained to form a perimeter and hope for the best", Lombardo said. Marilou Danley, the suspect's live-in girlfriend, continues to cooperate with authorities as well.
Hotel records handed to investigators show "substantial gambler" Paddock was allowed to stay in the hotel free of charge, United States reports say.
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