ATF: Las Vegas shooter modified a dozen guns with bump stocks

People scramble for shelter at the Route 91 Harvest country music festival, Oct. 1, 2017, in Las Vegas. (Photo: David Becker/Getty Images)

People scramble for shelter at the Route 91 Harvest country music festival, Oct. 1, 2017, in Las Vegas. (Photo: David Becker/Getty Images)

The man police say rained down bullets into a crowded country music festival on the Las Vegas strip Sunday modified a dozen guns with devices mimicking fully automatic fire, federal authorities confirmed Tuesday.

The Bureau of Alcohol, Tobacco, Firearms and Explosives traced all 47 firearms recovered from 64-year-old Stephen Paddock‘s hotel room and his two Nevada residences. San Francisco Special Agent in Charge Jill Snyder said Tuesday the agency found 12 bump stocks in the two-room suite at the Mandalay Bay Resort and Casino where Paddock spent four days stockpiling 23 guns and thousands of rounds of ammunition in preparation for Sunday’s attack.

Snyder said the bump stocks “simulate automatic fire,” though she didn’t identify which firearms from Paddock’s arsenal of rifles, shotguns and handguns were used in the shooting.

Authorities still don’t know why Paddock, a retired accountant and prolific gambler, opened fire from the 32nd floor of the Mandalay Bay, killing 59 and wounding more than 500 others gathered on the strip below for the Route 91 Harvest Festival. Paddock killed himself before the Las Vegas Metropolitan Police Department could enter his hotel room, leaving behind few clues as to his motivations.

“I don’t have a lot of answers yet,” Undersheriff Kevin C. McMahill told media during a press conference Tuesday as he pleaded for ongoing patience during the investigation. “We have a responsibility to get it right.”

The department released a compilation of body camera recordings captured during the shooting Tuesday showing officers directing civilians to safety — bursts of gun fire notably audible in the chaotic footage.

McMahill said Paddock installed security cameras in the hallway and the peephole of his hotel room door “so he could see law enforcement and security approaching.” He confirmed crime scene photos of the shooter’s suite leaked to media earlier Tuesday were authentic.