LAS VEGAS — A gunman on a high floor of a Las Vegas hotel rained a rapid-fire torrent on an outdoor concert festival on Sunday night, leaving at least 59 people dead, injuring 527 others, and sending thousands of horrified survivors fleeing for cover, in one of the deadliest dreadful mass shootings in American history.

Online video of the attack near the Mandalay Bay Resort and Casino showed the singer Jason Aldean’s performance at the Route 91 Harvest Festival, a three-day country music event, being broken up by the sound of gunfire. The music stopped, and as victims fell bleeding, concertgoers screeched, ducked for cover, or ran. “Get down,” one shouted. “Stay down,” screamed another.

The police found a weapon store in the gunman’s hotel room.

At least 23 firearms, including a handgun, were found in Mr. Paddock’s hotel suite, according to the Las Vegas Metropolitan Police Department. Some were rifles equipped with scopes, said Sheriff Joseph Lombardo of the Police Department, adding that Mr. Paddock used multiple rifles during the attack.

A federal law enforcement official earlier said there were at least 20 rifles in the suite, along with hundreds of rounds of ammunition, including two rifles outfitted with scopes and set up on tripods in front of two big windows. Another official said that among the weapons were AR-15-style assault rifles. Both officials spoke on the condition of anonymity because they were not authorized to divulge details of the investigation.

Sheriff Lombardo said that Mr. Poddack carried at least 10 suitcases into his hotel room over a period of time.

Sheriff Lombardo said that Mr. Paddock fired through his hotel room door at security guards, arresting one in the leg. The guard is still alive, he said. SWAT officers went in after the guard was shot.

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