Las Vegas: Las Vegas gunman Stephen Paddock set up several cameras up in his hotel room and one on a luggage cart in the hallway capturing the arrival of officers, police say.
Paddock, 64, a retiree and multimillionaire gambler, opened fire on the Route 91 Harvest country music festival on Sunday night, local time, killing 59 people and injuring more than 500.
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Shooter set up multiple cameras in Mandalay Hotel: police
Stephen Paddock, the gunman responsible for the deaths of more than 50 people in Las Vegas on Sunday, had surveillance cameras to detect police, according to local authorities.
Over four days, he wheeled more than 10 suitcases into Room 32135 of the Mandalay Bay Resort and Casino, about 450 metres from the festival site, and unloaded a cache of 23 guns, ammunition, tripods and bump-stock devices to modify rifles to make them discharge ammunition more quickly.
On Wednesday, Las Vegas Metropolitan Police Sheriff Joe Lombardo confirmed investigators found several cameras inside and outside the room, including one mounted on a luggage cart with views down the hallway.
He did not believe that Paddock recorded or transmitted footage from the cameras but they might have been used to monitor the arrival of officers.
"I anticipate he was looking for anybody to come and take them [sic] into custody," he said.
While no motive has been uncovered, Sheriff Lombardo said it was obvious that Paddock's massacre was premeditated and well organised.
"This individual was obviously premeditated. It was pre-planned extensively and I'm pretty sure he evaluated everything he did."
He said that a search of a home in Reno, Nevada, belonging to Paddock uncovered a further five handguns, two shotguns and a plethora of ammunition.
Police found 19 guns, explosives and several rounds of ammunition in a home in Mesquite, Nevada, that Paddock shared with his girlfriend, Marilou Danley.
Photos emerged on Twitter on Wednesday offering a glimpse inside Paddock's hotel room, showing bullets and assault rifles strewn on the floor, a couch pressed up against the suite's double doors and a hammer possibly used to smash open two windows from which he fired.
Sheriff Lombardo said he was "troubled" by their release and there was an internal investigation into how they were obtained by journalists.
He said police intended to interview Danley who he said was in the Philippineswhen she returned this week.
She is considered a "person of interest" although he gave no hint about what she may have already told investigators.
Danley, 62, an Australian-Filipino grandmother, was on a holiday with friends and family at the time of the shooting, MSNBC reported.
Lombardo later told a press conference Daley was in the Philippines, authorities were in contact with her and hoped to have more information soon.
She met Paddock about 2014 after she divorced her husband of 22 years, Geary Danley, and moved away from Reno.
She lived in an over-55s community with Paddock in Mesquite.
MSNBC and CNN both reported that Danley wired $US100,000 ($130,000) to the Philippines in recent weeks.
For years, Paddock had made millions as a professional gambler playing $US100 hands of poker, his brother Eric said.
It has emerged that Paddock was gambling huge sums of money in the days leading up to the massacre.
In two weeks, he had made 16 mandatory reports to federal authorities of casino wins above $US10,000 each day.