Sheriff Joseph Lombardo said officers searching the house in Mesquite, Nevada recovered "in excess of 18 additional firearms, some explosives and several thousand rounds of ammo, along with some electronic devices we're evaluating at this point."
Lombardo said the death toll from the Sunday night assault on an open-air concert on the Vegas Strip had risen to 59, while 527 people had been injured.
He said law enforcement were working four separate crime scenes: Paddock's room at the Mandalay Bay hotel, the concert venue, the gunman's house in Mesquite, and another house he owns in northern Nevada which a SWAT team was poised to raid.
The arsenal uncovered in Mesquite comes on top of at least 16 firearms discovered in the Vegas hotel room, from which Paddock launched the deadly assault before killing himself.
Asked if they had discovered anything to bolster the claim of responsibility by the Islamic State group, Lombardo replied:
"Good for them -- no, we have no evidence of that."
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
Follow NDTV for latest election news and live coverage of assembly elections 2019 in Maharashtra and Haryana.
Subscribe to our YouTube channel, like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.