A staffer at the hotel also reported that Paddock acted abruptly with them over some other issue, Milton reports.
The man behind the mass shooting in Las Vegas shot and injured a security guard six minutes before carrying out the attack, officials say, in a major change to the timeline of events.
Investigators found more than 40 firearms in Paddock's hotel room and at his residence in Mesquite, Nevada.
"There was not a note in the suspect's room".
This revelation raises the question of what caused Paddock to stop the attack, as previously it was thought to be the interruption of the security guard.
"It's amazing" that Campos didn't sustain more injuries, Lombardo said.
Clark County Sheriff Joseph Lombardo said last week that Paddock's massive arsenal appeared to indicate he may have had an accomplice, though no such individual has been identified.
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A week later, investigators still haven't found a motive for Paddock's rampage. We didn't know where he was going to be in that room'. "So how did we miss this, in the see-something-say-something era?"
Officer Newton said: 'His plan might have been to shoot it out with us because there was a rifle on a bipod near the door, and just the amount of ammunition and weapons he had, he could have held us off for hours'.
Paddock booked rooms over other music festivals in the months before opening fire on the Route 91 Harvest Music Festival, authorities said. The gunman shot himself as officers closed in. Also, there's no evidence of an affiliation with a terrorist group or belief in any radical ideology.
Investigators are also unsure why Paddock made a decision to stop shooting.
The interviews with Paddock's brother Saturday and Sunday were part of an exhaustive search through the 64-year-old's life in search of clues about why he unleashed gunfire from broken windows in the 32rd floor of the Mandalay Bay hotel casino.
The official also disclosed to the AP that Paddock, a high-stakes gambler, took at least a dozen cruises overseas in the last few years, majority with his girlfriend, Marilou Danley, the AP reported Saturday.