Country music star Jason Aldean was performing Sunday night at the end of the three-day Route 91 Harvest Festival when the gunman opened fire across the street from inside the Mandalay Bay Hotel and Casino.
At least 58 people were killed and 515 were injured.
It was the deadliest shooting in modern U.S. history.
The “nonstop gunfire,” according to one witness, sent more than 22,000 country music fans scrambling for their lives.
Two sources familiar with the investigation said there was a combination of rifles and handguns at the scene, and one of the sources said there were 19 weapons in the room.
Terrified bystanders ducked, ran and then sprang into action, frantically caring for the wounded.
Concertgoers who had just been enjoying the final night of the Route 91 Harvest Music Festival, which was taking place across the street from Mandalay Bay, made makeshift stretchers out of police barricades.
As ambulances rushed to the scene, they plugged wounds with their bare hands and used their clothing to try to stanch each other’s bleeding.
At least one man described a stranger who died in his arms.
An off-duty Las Vegas police officer who was attending the concert was among the dead, police said.
Jason Aldean was the headliner of Sunday night’s concert; video showed his rushing off the stage amid the gunfire.
Other performers from this weekend included country stars Jake Owen, Big & Rich, Luke Combs and Dylan Scott.
In the wake of the shooting, the Las Vegas Police Department said authorities responded to a room on the 32nd floor of the Mandalay Bay hotel, where police said the suspected gunman, 64-year-old Stephen Paddock, was dead.
Police said they believe Paddock killed himself prior to police entry.
The motive was unclear.
“I can’t get into the mind of a psychopath,”
Sheriff Joseph Lombardo said at a news conference this morning.
Officials said this morning they have found no connection between the shooting and any international terrorist group.
Officials added that the suspect was not known to law enforcement.
President Trump called the attack
“an act of pure evil”
and said the FBI and Department of Homeland Security are working with local authorities in the investigation.
Mr. Trump spoke with Nevada’s governor and the mayor and sheriff of Las Vegas, White House press secretary Sarah Sanders said.
He will hold a moment of silent for the victims Monday afternoon and will travel to Las Vegas on Wednesday.