Authorities released police body camera video that showed the chaos of the attack as officers tried to figure out the location of the shooter and shuttle people to safety. "People have called saying they can't be in crowds".
McMahill said he was aware that since Sunday's massacre, rumors and speculation had abounded in the absence of a confirmed motive. "And we want to identify that source". He said they have looked into details regarding Paddock's personal life, political affiliations, social behaviors, and economic situation - but answers remain evasive.
Reports have emerged in recent days that Paddock may have targeted other sites for attack in Las Vegas, Chicago or Boston, which police have said they were investigating.
Sheriff Lombardo said it is crucial to talk to anyone who knew Paddock in the hunt for possible accomplices. He said the items included purses, wallets, cell phones, and chairs: "Whatever was dropped when people started running".
The shooter brought 10 luggages worth of weapons, 23 guns, many of them rifles, and thousands of rounds of ammunition, up to his hotel room. TMZ reports that Paddock didn't have an assigned room but specifically asked for a room with a view.
Where other mass killers have left behind a trail of plain-sight clues that help investigators quickly understand what drove them to violence, Paddock, 64, had almost no close friends, social media presence or other clear connections to the broader world.
Paddock had 1,600 rounds of ammunition in his auto, along with fertilizer that can be used to make explosives and 50 pounds of Tannerite, a substance used in explosive rifle targets.
"I'm sorry to tell you I don't know what he was going to do with all of that Tannerite, I wish I did", Mr McMahill said. I wish we did.
The fertilizer found in his vehicle was ammonium nitrate - a notorious bomb-making ingredient favored by terrorists groups like the IRA and al-Qaeda. Paddock's girlfriend, Danley, has been unable to provide a motive for the mass killing, according to the information.
Even a few months before the shooting, however, Paddock and Danley's relationship at least appeared to be on solid ground.
Investigators believe a note found in the Las Vegas gunman's hotel room contained a series of numbers that helped him calculate more precise shots, a law enforcement official said. Investigators are trying to trace that money. Federal Bureau of Investigation agents interviewed Marilou Danley, Paddock's girlfriend, hoping she could provide insight into the shooting, but she has said she knew nothing of his plans or potential for such violence.
Marilou Danley knew him as a "kind, caring, quiet man" but in recent months she had grown concerned about her boyfriend's mental health, she told FBI investigators this week.
Paddock sent Danley on a trip to her native Philippines before the attack, and she was unaware of his plans and devastated when she learned of the carnage while overseas, she said in a statement.