Officials weren't immediately able to learn the precise date of the transfer, and the Federal Bureau of Investigation was working with Philippine authorities on the matter, the source said.
The presence of other hotel guests in the rooms surrounding Paddock's meant that police couldn't return fire from the ground, he explained. Authorities have not said if the cameras were transmitting a signal.
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 vehicle, and his meticulous plan, but they don't know who that might be.
Australia's Channel 7 TV network interviewed Marilou Danley's sisters with their faces obscured and their names withheld.
In a statement read Wednesday by attorney Mike Lombard, Danley said that when 64-year-old Paddock bought her a ticket to visit family members in the Philippines, then wired $100,000 with instructions to buy her family a house, she assumed her millionaire boyfriend's intention was to break off their relationship.
"Shoes, baby strollers, chairs, sunglasses, purses". "There were bloodstains everywhere". Some concert-goers huddled in the basement of the nearby Tropicana hotel-casino. He took his own life before authorities found 23 weapons in his hotel room and another 19 at his home in Mesquite, Nevada.
Twelve of his rifles were fitted with so-called bump stocks, officials said, allowing the guns to be fired nearly as though they were automatic weapons.
The difference between semi-automatic weapons and automatic weapons is what happens when you pull the trigger. With a fully automatic firearm, one trigger pull can unleash continuous rounds until the magazine is empty.
An employee of North Raleigh Guns demonstrates how a "bump" stock works at the Raleigh, N.C., shop. At least 45 patients at two hospitals remained in critical condition. At one point, the number was released as 59 plus the shooter. It said investigators were trying to trace the money and were probing at least a dozen financial reports over the past several weeks that said Paddock gambled more than $10,000 per day. If the suicide didn't destroy Paddock's brain, experts may even find a neurological disorder or malformation, he said.
He said: "The initial gun shots were machine gun fire".
Paddock had a business degree from Cal State Northridge.
Ms Danley assured her family she has a "clean conscience" following Sunday night's rampage, her brother told the US's ABC News in the Philippines. He said he was at a loss to explain the massacre.
Danley, 62, called Paddock a "kind, caring, quiet man" and said she hoped to have a future with him.
Clark County Sheriff Joseph Lombardo told reporters Wednesday just after 9 a.m. local time that Danley would be questioned in the next half hour at the FBI's Los Angeles field office.