A lone gunman that killed at least 59, leaving hundreds injured at a La Vegas Music concert, Stephen Paddock, lived in a community of senior citizens in the small town of Mesquite, north-east of Las Vegas.
He reportedly lived with a woman called Marilou Danley who is out of the country in Japan, and does not appear to be involved, police said.
Las Vegas Sheriff Joseph Lombardo said when police searched the property after the attack they found 19 “additional firearms, some explosives and several thousand rounds of ammo, along with some electronic devices we’re evaluating at this point”.
Officers also found ammonium nitrate in Paddock’s car. The explosive found in his home was tannerite, the sheriff said.
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There is a second house in northern Nevada which Swat teams are due to check for booby-traps before carrying out a search , Sheriff Lombardo said.
David Famiglietti of the New Frontier Armory told the BBC that Paddock had purchased firearms at his store in North Las Vegas in the spring of this year, meeting all state and federal requirements, including an FBI background check
However, the shotgun and rifle Paddock bought would not have been “capable of what we’ve seen and heard in the video without modification,” Famiglietti said.
Lone wolf attack
Las Vegas Sheriff Joe Lombardo described the shooting as a “lone wolf” attack.
So-called Islamic State (IS) has claimed to be behind the attack, saying Paddock had converted to Islam some months ago.
But the group provided no evidence for this and has made unsubstantiated claims in the past.
FBI Special Agent Aaron Rouse told a news conference: “We have determined at this point no connection to an international terrorist organisation.”
How did the attack unfold?
The final shows of the three-day Route 91 country music festival were in full swing when the gunman struck.
According to police, Paddock had booked into the hotel four days earlier, on 28 September, reportedly using some of Ms Danley’s identity documents.
Sheriff Lombardo said there were 10 suitcases in the suite, which had two rooms.
Thousands were enjoying a performance by top-billing singer Jason Aldean when the first of several bursts of automatic gunfire rang out – hundreds of shots, witnesses say. That was late on Sunday night – 22:08 local time (05:08 GMT on Monday).
Hundreds of concert-goers scrambled for cover, flattening themselves against the ground, rushing for the exits or helping others to escape as Paddock sprayed the site from his high vantage point.
Many hotels on the Las Vegas strip close to the scene were placed on police lockdown and parts of Las Vegas Boulevard were shut.
Nevada has some of the least stringent gun laws in the United States.
People are allowed to carry weapons and do not have to register themselves as a gun-owner.
Background checks are done when people buy guns, but they are also allowed to sell them privately.