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Las Vegas Police: 'No Evidence' of Political or 'Radical Ideologies' Motivating Shooter

Las Vegas police, while saying they're still stumped on the motive behind Sunday night's massacre at a country music festival, said today that they haven't found any evidence to indicate Stephen Paddock had political or "radical ideologies" that motivated the attack.

Undersheriff Kevin McMahill told CNN this evening that authorities also haven't determined what Paddock intended to do with his explosives-stocked car at the Mandalay Bay hotel, which included 1,600 rounds of ammunition as well as ready-to-use tannerite and two mixer chemicals, ammonium nitrate and aluminum chloride.

"I don't know what he was doing with it," McMahill said, noting there's "no evidence that material in the vehicle was going to be used as an IED. It's one of the mysteries of this attack."

"I believe he certainly had nefarious intent with that material; I don't know what that intent was."

McMahill said he was "very confident, very certain that there was not another shooter in the room as he conducted this mass murder rampage." Before this statement, NBC News reported that investigators found a cell phone charger in the room not matching any of Paddock's phones. Investigators also reportedly determined that one of Paddock's card keys was used to access his room during a period when Paddock's car had left the hotel garage.

Asked if Paddock had help planning the attack, the undersheriff said that's why investigators are "combing over this man's life from birth to death."

"It's hard to believe that one individual planned this attack and executed without anybody else knowing anything about it," McMahill said.

Investigators are also trying "to understand, to evaluate whether he had any political, any economic, any social, any radical ideologies that may have led him down a particular path," he said. ISIS has repeatedly claimed this week that Paddock conducted the attack on their behalf.

"What I can confirm to you today is we have found no evidence of any of that as I'm standing before you today," the undersheriff added.

McMahill said Paddock's girlfriend, Marilou Danley, "continues to cooperate with the FBI" but he wouldn't say if the information she has been providing has been helpful. "I'm aware of the interactions the FBI has had, but not prepared to discuss with you any of the information we've obtained," he said.

After confirmation that Paddock rented an Airbnb overlooking the Life is Beautiful pop-rap festival in Vegas the week before the Route 91 Harvest Festival, reports surfaced that the gunman also booked a room overlooking the Lollapalooza festival in Chicago in August, insisting with the manager that he had to have a view room because he and his wife had met at the festival and were celebrating their anniversary. He ended up no-showing the reservation. Paddock also reportedly searched for hotels around Boston's Fenway Park.