The gunman recently bought several weapons.
Christopher Sullivan, general manager of Guns Guitars, a gun shop in Mesquite, Nev., said confirmed that Mr. Paddock had bought three guns at his shop — a handgun and two rifles — within the last year. All the purchases were legal and cleared routine federal screening, Mr. Sullivan said.
“The man does not have a criminal history,” Mr. Sullivan said of Mr. Paddock.
Mr. Sullivan, who said he had also been contacted by the F.B.I. and the Bureau of Alcohol, Tobacco, Firearms and Explosives, would not provide detailed descriptions of the guns. “We have cooperated with local and federal authorities,” he said.
He described Mr. Paddock as seeming like “a normal fellow, a normal guy — nothing out of the ordinary.”
“As for what goes on in a person’s mind, I couldn’t tell you,” Mr. Sullivan said. “I know nothing about him personally.”
How did the shooting unfold?
The first reports of the shooting came at 10:08 p.m. local time. Officers were overheard on police radio channels reporting that they were pinned down by gunfire. Shortly before midnight, the Las Vegas police reported that “one suspect is down,” and soon after, the police said they did not believe there were any more active gunmen.
The Route 91 Harvest Festival bills itself as “three days of country music on the Vegas Strip,” and Sunday night’s performance was the last of the festival. The site of the concert, the Las Vegas Village and Festival Grounds, operated by MGM Resorts, sprawls over 15 acres and has a capacity of 40,000 people. The festival’s website said this year’s three-day concert was sold out.
Tenaja Floyd of Boise, Idaho, said many of the people around her in the concert crowd thought at first that the sounds came from fireworks, but “I knew immediately, that wasn’t fireworks.” She said her mother, Jennifer, threw her to the ground and lay on top of her to protect her. As people started running out of the venue, she said, they thought they might be trampled, so they decided to join the rush to leave.
Video of the shooting captured nine seconds of continuous rapid fire, followed by 37 seconds of silence from the weapon and panicked screaming from the crowd. Gunfire then erupted again in at least two more bursts, both shorter than the first.
The police reported clearing out the Mandalay Bay’s 29th floor and then working their way up to the 32nd floor. A police Twitter post described reports of an “active shooter” near or around the Mandalay Bay casino.
SWAT units swarmed the upper floors of the Mandalay Bay, closing in on the source of the shooting, a room on the 32nd floor where they found the gunman, the sheriff said. “We believe the individual killed himself prior to our entry.”
Video from the shooting showed Mr. Aldean, the final performer of the night, running off the stage as the gunfire erupted.
Jake Owen, a country singer who was on stage with Mr. Aldean when the shooting began, told CNN on Monday that it was like “shooting fish in a barrel from where he was.”
“This is not an exaggeration: This shooting was going on for at least 10 minutes,” he added. “It was nonstop.”
Concertgoers described hearing round after round of gunfire. “Everyone was running, you could see people getting shot,” Gail Davis, one of the witnesses, said. “I’ve never been that scared in my life,” she added. “To have this happen, I can’t wrap my mind around it.”
A Hospital Deals With the Victims
The surge of patients at Sunrise Hospital and Medical Center, within walking distance of the concert, was almost unthinkable. In the first hours, 90 patients arrived at the Level Two trauma center, and by noon on Monday, the total was 180.
Of those, 124 “met the criteria for trauma activation,” said Dr. Jeff Murawsky, the hospital’s chief medical officer. They included patients with single and multiple gunshot wounds to the head, face, chest, body, arms and, in one case, a finger.
The less severely injured included those who fell or were pushed as they ran. By Monday afternoon, 16 patients had died, some on arrival and others after being treated.
Patients were sorted on arrival in the lobby of the emergency room using a scale of one — most critical — to five, a system used daily that Dr. Murawsky said helped in the emergency. A separate area at Sunrise was created for those whom the doctors deemed “unsalvageable.” Still, Dr. Murawsky said, “our trauma surgeons don’t feel like we were ever in a situation where we weren’t able to do our best.”
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