Scenes from Las Vegas mass shooting

A gunman perched on the 32nd floor of a Las Vegas casino unleashed a hail of bullets on an outdoor country music festival below, killing 58 people and injuring 489 others — as tens of thousands of concertgoers screamed and ran for their lives, officials said Monday. It was the deadliest mass shooting in modern U.S. history.

SWAT teams using explosives stormed the gunman’s hotel room and found he had killed himself, authorities said. He had as many as 10 guns with him, including rifles, they said.

There was no immediate word on the motive for the bloodbath.

Sheriff Joseph Lombardo said authorities believe it was a “lone wolf” attack. And the U.S. Homeland Security Department said there was no “specific credible threat” involving other public venues in the U.S.

Country music star Jason Aldean was performing Sunday night at the end of the three-day Route 91 Harvest Festival in front of a crowd of more than 22,000 when the gunman opened fire from inside the Mandalay Bay Hotel and Casino across the street.

The gunman was identified as Stephen Craig Paddock, 64, of Mesquite, Nevada. He had checked into the hotel room on Thursday, authorities said. (AP)

Read more from Yahoo News:

A surreal scene as Las Vegas returns to business after Sunday massacre
– Portrait of a mass killer: The details don’t add up
Las Vegas, a ‘soft target,’ long feared an attack
Now I Get It: Why haven’t authorities named Las Vegas gunman a terrorist?
Photos: The front page: How newspapers portrayed the Vegas massacre
– Photos: Makeshift memorials pay tribute to Las Vegas shooting victims

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Scenes from Las Vegas mass shooting

Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on Oct. 2, 2017. (Photo: Mark Ralston/AFP/Getty Images)

Scenes from Las Vegas mass shooting

Concert-goers wait for a ride outside the Thomas & Mack Center after a mass shooting at a country music festival on Oct. 2, 2017 in Las Vegas, Nevada. People who could not go to hotel-casinos that were closed after the shooting temporarily stayed at the center. (Photo: Ethan Miller/Getty Images)

Scenes from Las Vegas mass shooting

Broken windows are seen on the 32nd floor of the Mandalay Bay Resort and Casino after a lone gunman opened fired on the Route 91 Harvest country music festival on Oct. 2, 2017 in Las Vegas. (Photo: David Becker/Getty Images)

Las Vegas Shooting

Debris is strewn through the scene of a mass shooting at a music festival near the Mandalay Bay resort and casino on the Las Vegas Strip, Monday, Oct. 2, 2017, in Las Vegas. (Photo: John Locher/AP)

Scenes from Las Vegas mass shooting

Two festivalgoers leave the area around the Mandalay Hotel after a gunman killed more than 50 people and wounded more than 500 others when he opened fire on a country music concert in Las Vegas, Nevada on Oct. 2, 2017. (Photo: Mark Ralston/AFP/Getty Images)

Scenes from Las Vegas mass shooting

A gunman opened fire at a country music festival on the Las Vegas Strip on Oct. 1, killing scores of people. (Reuters)

Scenes from Las Vegas mass shooting

Be advised – The Following Contains Visual Coverage of Scenes of Injury or Death

Scenes from Las Vegas mass shooting

People scramble for shelter at the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

Police run to cover at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Oct. 1, 2017, in Las Vegas. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip. (Photo: John Locher/AP)

Scenes from Las Vegas mass shooting

People run from the Route 91 Harvest country music festival after apparent gun fire was hear on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A man lays on top of a woman as others flee the Route 91 Harvest country music festival grounds after a active shooter was reported on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

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A Las Vegas Metropolitan Police officer stands in the intersection of Las Vegas Boulevard and Tropicana Ave. after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada. (Photo: Ethan Miller/Getty Images)

Scenes from Las Vegas mass shooting

People flee the Route 91 Harvest country music festival grounds after a active shooter was reported on Oct. 1, 2017 in Las Vegas. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

Las Vegas police and emergency vehicles sit on scene following a deadly shooting at a music festival on the Las Vegas Strip early Oct. 2, 2017. (Photo: Chase Stevens/Las Vegas Review-Journal via AP)

Scenes from Las Vegas mass shooting

People are directed to rides outside the Thomas & Mack Center after a mass shooting at a country music festival on Oct. 2, 2017 in Las Vegas. (Photo: Ethan Miller/Getty Images)

Scenes from Las Vegas mass shooting

People take cover at the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A cowboy hat lays in the street after shots were fired near a country music festival on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

People tend to the wounded outside the Route 91 Harvest Country music festival grounds after an apparent shooting on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A man in a wheelchair is taken away from the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A wounded woman is moved outside the Tropicana during an active shooter situation on the Las Vegas Strip in Las Vegas Sunday, Oct. 1, 2017. (Photo: Chase Stevens/Las Vegas Review-Journal via AP)

Scenes from Las Vegas mass shooting

People run from the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. , 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

People are searched by Las Vegas police at the Tropicana Las Vegas during an active shooter situation on the Las Vegas Strip on Sunday, Oct. 1, 2017. (Photo: Chase Stevens/Las Vegas Review-Journal via AP)

Scenes from Las Vegas mass shooting

People run from the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A person lies on the ground covered with blood at the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A person runs from the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A person lies on the ground at the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A wounded woman is moved outside the Tropicana during an active shooter situation on the Las Vegas Strip in Las Vegas Sunday, Oct. 1, 2017. (Photo: Chase Stevens/Las Vegas Review-Journal via AP)

Scenes from Las Vegas mass shooting

A man stands outside the the Route 91 Harvest country music festival grounds after an active shooter was reported on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

A pair of cowboy boots is shown in the street outside the concert venue after a mass shooting at a music festival on the Las Vegas Strip in Las Vegas, Nevada on Oct. 1, 2017. (Photo: Las Vegas Sun/Steve Marcus/Reuters)

Scenes from Las Vegas mass shooting

Las Vegas police patrol along the streets outside the the Route 91 Harvest country music festival grounds after a active shooter was reported on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

People assist a wounded woman at the Tropicana during an active shooter situation on the Las Vegas Stirp in Las Vegas, Oct. 1, 2017. (Photo: Chase Stevens/Las Vegas Review-Journal via AP)

Scenes from Las Vegas mass shooting

Police officers advise people to take cover near the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Oct. 1, 2017, in Las Vegas. (Photo: John Locher/AP)

Scenes from Las Vegas mass shooting

A police officer takes cover behind a truck at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Oct. 1, 2017, in Las Vegas. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip. (AP Photo/John Locher)

Scenes from Las Vegas mass shooting

People carry a person at the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

People react at gunshots heard at music festival in Las Vegas, Oct. 1, 2017 in this picture obtained from social media. (@RTBLECKvia Reuters)

Scenes from Las Vegas mass shooting

A police officer runs along a sidewalk near a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Oct. 1, 2017, in Las Vegas. (Photo: John Locher/AP)

Scenes from Las Vegas mass shooting

Police officers stand by as medical personnel tend to a person on Tropicana Ave. near Las Vegas Boulevard after a mass shooting at a country music festival nearby on Oct. 2, 2017 in Las Vegas, Nevada. (Photo: Ethan Miller/Getty Images)

Scenes from Las Vegas mass shooting

An ambulance leaves the intersection of Las Vegas Boulevard and Tropicana Ave. after a mass shooting at a country music festival nearby on Oct. 2, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

Las Vegas police stand guard along the streets outside the the Route 91 Harvest country music festival grounds after a active shooter was reported on Oct. 1, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)

Scenes from Las Vegas mass shooting

An injured person is tended to in the intersection of Tropicana Ave. and Las Vegas Boulevard after a mass shooting at a country music festival nearby on Oct. 2, 2017 in Las Vegas, Nevada. (Photo: David Becker/Getty Images)