Police said Monday they had recovered explosives and an ammunitions cache from a house owned by Las Vegas gunman Stephen Paddock, as they upped the death toll from the attack to 59.

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.