Speaking to the media on Monday, Las Vegas Sheriff Joe Lombardo confirmed that Mandalay Bay security guard Jesus Campos was shot by gunman Stephen Paddock a full six minutes before Paddock fired on the crowd at the Route 91 Harvest Fest.
"This individual purposely hid his actions leading up to this event, and it is hard for us to find the answers", said Lombardo, who agreed he was frustrated with the speed of the investigation.
"Then immediately, upon being injured, he notified security", Sheriff Joseph Lombardo said of the hotel guard at a Monday evening briefing.
At least 23 guns - 12 of which were equipped with bump-stocks, or rapid fire devices - were found inside Paddock's hotel room.
"The timeline associated with the original shot of Mr. Campos has changed through investigation", he said.
The open door was not in Paddock's hotel room, he said.
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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 first police officers arrived on the hotel floor at 10:17 pm. and saw the wounded Campos at 10:18 pm, who directed the officers to the killer's suite.
The new information comes as investigators are still struggling to explain why Paddock carried out the deadliest mass shooting in modern American history.
Paddock had a document in the room with him that contained numbers, Lombardo said, adding he could not immediately say what goal the figures served.
"In coordination with the FBI's behavioural analysis unit, a comprehensive picture is being drawn as to the suspect's mental state and now we do not believe there is one particular event in the suspect's life for us to key on", Lombardo said.
"We believe he made a decision to take the lives he did and he had a very purposeful plan that he carried out", he added.
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Despite Paddock being the only gunman, the officers recalled their anxiety that other people were involved after finding the extent of Paddock's arsenal.
But so far, authorities looking to see if anyone may have aided Paddock found no evidence of the gunman having associates in Las Vegas. The suspect, we know that he attempted to shoot at the fuel tanks, we know that he had some personal protection equipment in the room, we know that the auto that was found in the parking garage still, contained binary explosives.
"We do not know whether he had planned to cause additional harm outside of what happened at Mandalay Bay", Lombardo said.
Authorities are still working to determine the shooter's motives, which still remain largely a mystery a week after the massacre. He was described as a man of considerable financial means who avidly played video poker and avoided human contact when possible. These officers, who at the time feared they might be dealing with multiple shooters, entered a hotel stairwell and discovered that Paddock had apparently blocked the door leading to the hallway near his suite.
The Las Vegas police officers who stormed the hotel room of gunman Stephen Paddock a week ago have been describing what they found to U.S. media.
The shooting spree began around 10:05 p.m., police said. He sped to the scene, but could only get so close, and eventually had to take the last few blocks on foot while wearing cowboy boots.
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