A gunman in a Las Vegas hotel opened fire Sunday night at a concert.
The shooting happened near the Mandalay Bay Resort and Casino.
At least 20 people were killed and more than 100 others injured, hospital officials said.
Thousands flee as SWAT units searched for the attacker who was later shot dead.
Video posted online showed the country singer Jason Aldean performing outside the hotel at Route 91 Harvest, a country music festival, interrupted by the sound of automatic gunfire.
The music stopped, and concertgoers ducked for cover.
“Get down,” one shouted. “Stay down,” another voice was heard screaming.
Shortly before midnight the Las Vegas Metropolitan Police Department reported that “one suspect is down,” and soon thereafter the police said they did not believe there were any more active gunmen.