At least one of them had been modified with a legal “bump stock”-style device that enables the shooter to rapidly fire off rounds without actually converting the rifle to a fully automatic weapon, one federal law enforcement source said. Other weapons may have been converted to fully automatic fire and were still being examined.
Ammonium nitrate, sometimes used in manufacturing explosive devices, was found in Paddock’s vehicle, Clark County Sheriff Joe Lombardo said.
Authorities believe the gunman used multiple rifles during the attack, Lombardo said. They also think he used about 10 suitcases to move the weapons to the hotel room, which the sheriff described as a large suite with two rooms.
Investigators are also looking into whether Paddock attended another music festival in Las Vegas last weekend, Life Is Beautiful.