Bureau of Alcohol, Tobacco and Firearms Special Agent in Charge Jill Schneider also told reporters Tuesday that Stephen Paddock had almost 50 guns in three locations, a combination of rifles, shotguns and pistols.
Clark County Coroner John Fudenberg clarified the number of people who died as a result of the attack: 58.
Ms Danley's brother in the Philippines said she had a "clean conscience". He also made mention of his girlfriend, former Australian resident Marilou Danley, who has been named as a "person of interest" in the investigation.
"He was shot, but I can not tell you it was the police that shot him". The Mandalay Bay says its staffers had gone in and out of the suite before the attack without noticing anything amiss.
Four killed in attack on IHK paramilitary camp
Besides the AK 47 rifles and pistols, some grenades were also recovered from the possession of the militants, said officials. A police officer said two suspected rebels and a paramilitary officer had been killed in the fighting so far.
The suspect, 64-year-old Stephen Paddock, "fired off and on for somewhere between 9 and 11 minutes" in a dozen or so volleys, said Las Vegas Metro Police Undersheriff Kevin McMahill at a press conference Tuesday evening.
U.S. website The Daily Beast is reporting gunman Stephen Paddock rented rooms overlooking the Life Is Beautiful Festival at the Ogden apartment tower, quoting a senior law enforcement source briefed on the investigation. Nineteen more guns were found at his Mesquite home and seven at his Reno house.
Private citizens can only own fully automatic weapons through a license from the Bureau of Alcohol, Tobacco and Firearms. Danley left her husband, Geary Danley, in 2013 and moved in with Paddock.
Local news reports soon after his crimes were reported to have said that neighbours "couldn't believe that the colorful businessman, then 34 years old, was involved in crime".