Clark County Sheriff Joseph Lombardo said at a news conference Wednesday night that Paddock must have had some help along the way given his huge arsenal the explosive materials found in his auto, and his meticulous plan, but they don't know who that might be.
Paddock killed dozens and injured hundreds on Sunday night when he opened fire at an outdoor country music festival in Las Vegas.
The brother's account drastically differs from a witness who said the 64-yer-old would verbally abuse Danley in public often.
Police found 23 guns inside Paddock's hotel suite and thousands of rounds of ammunition, according to CNN.
Ninety-three people were shot and killed by their own hand or by someone else's in the US on Sunday, and that doesn't include the 59 who were shot and killed from a window at Mandalay Bay in Las Vegas. All but three of the 59 victims have been identified, Lombardo said.
Sheriff Joseph Lombardo of the Las Vegas Metropolitan Police said at Wednesday night's press conference.
Rabadi also said such tools are often used by sportsmen who want to modify their weapons for activities like target practice.
While the White House has rebuffed calls to reopen the fraught USA debate on gun control, Congress did shelve a controversial plan to make it easier to purchase gun silencers and make it more hard to classify certain ammunition as "armor piercing".
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Danley arrived back in the U.S. late Tuesday night escorted by Federal Bureau of Investigation agents in Los Angeles.
She says he wired her money while she was there to buy a house for herself and her family.
Paddock transferred $100,000 to the Philippines in the days before the shooting, the AP reported. Danley, who said she is a mother and grandmother, asked for privacy for her and her family but offered to do "anything" she could "to help ease suffering" in her statement.
Sheriff Lombardo said that he didn't know what the suspect Stephen Paddock was planning with the explosives, if anything.
The Australia-based sisters of Las Vegas gunman Stephen Paddock's girlfriend say they believe Paddock sent her away so she wouldn't interfere with his plans to go on a shooting rampage.
Marilou Danley flew out of Manila's global airport on Tuesday night for Los Angeles, immigration bureau spokeswoman Maria Antoinette Mangrobang told AFP.
"We have had conversations with her and we believed her, at this time, not to be involved".
High up on the hotel's residential floors, a first responder radioed in: "I'm inside the Mandalay Bay on the 31st floor, I can hear automatic fire coming from one floor ahead. one floor above us".