Investigators found a total of 42 guns in a hotel room and in the home of Las Vegas shooter Stephen Paddock, 64. Paddock killed 59 people and wounded 527 in the nation's deadliest mass murder on Monday, October 1.
The victims were attending the Route 91 Harvest Country Music Festival in Las Vegas on Sunday.
Police say Paddock acted alone when he fired multiple modified semiautomatic rifles fitted with devices to simulate automatic gunfire.
Investigators found 2 rifles fitted with a "bump stock" device that allows semiautomatic weapons to shoot rapid fire rounds. Bump stock devices are legal and sold by Amazon.com and other online dealers.
23 weapons including 19 rifles were found among the arsenal in a spacious 2 room suite rented by Paddock at the Mandalay Bay Resort and Casino in Las Vegas.
Paddock constructed 2 platforms in front of the windows where he set up 2 rifles. Police found a camera set up in the suite to record Paddock firing down into the diverse crowd of various races and political affiliations.
Cameras were also set up in the hallways to alert Paddock to approaching police.
The cameras were most likely set up to thwart conspiracy theorists who often rush in with wild theories while ignoring the facts after a tragedy.
Authorities say Paddock used a tool, similar to a hammer, to break out 2 large tempered glass floor-to-ceiling windows in his suite.
Law enforcement officers sent a robot to take off the garage door of Paddock's Mesquite, NV house to make sure the house wasn't booby trapped. 19 more weapons were recovered from his home.
In addition to the guns and thousands of rounds of ammunition, police also found "several" pounds of ammonium nitrate, a material used to make explosives, inside Paddock’s car.
Police say Paddock methodically transported the weapons into the hotel room without raising the suspicions of the hotel staff. Authorities believe Paddock acted alone, but they want to interview his girlfriend, Marilou Danley, who conveniently traveled to Manila before the massacre.
Family members described Paddock as a multimillionaire retired accountant with a gambling habit who recently worked for Lockheed.
“Steve had nothing to do with any political organization, religious organization, no white supremacist, nothing,” said Paddock's brother, Eric Paddock.
Eric said their father was a convicted bank robber who spent several year’s on the FBI’s “Ten Most Wanted Fugitive” list.
A GoFundMe account set up for the victims has raised over $2 million in donations.
WATCH: Audio conversation from police breaching hotel room of Las Vegas shooting suspect Stephen Patterson pic.twitter.com/Wo6Uvq6PrA
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ABC NEWS: Police believe 50+ people dead, 200+ injured in Las Vegas massacre pic.twitter.com/4BsBBjqZJI
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RT Another Angel Of The Las Vegas Shooting Omg More Than 100 dead over 200 injured ? Pray ?? Follow Me For More Updates pic.twitter.com/HFfjDIzTbr
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Photos by ABC News, Gabe Ginsberg/Getty Images, David Becker/Getty Images