Jason Aldean was onstage when the shooting started.

By Jon Wiederhorn and Robyn Collins

Jason Aldean was onstage performing at the Route 91 Harvest Festival in Las Vegas, Nevada when a gunman opened fire, killing at least 58 and wounding more than 515 people. It was the deadliest mass shooting in U.S. History, CBS News reports.

Clark County Sheriff Joe Lombardo said the shooter was on the 32nd floor of the Mandalay Bay Hotel and Casinos, across the street from the country music festival, when he opened fire for more than 10 minutes. “We believe it’s a solo actor. A lone wolf,” Lombardo said.

The gunman, who was found dead at the scene, was a local resident, 64-year-old Stephen Paddock of Mesquite, Nevada.  Two police sources said that it does appear that the shootings were an act of terrorism and that Paddock was known to police in Mesquite and had a criminal history.

After the shooting, Aldean wrote that he and his crew were safe and offered prayers for the victims and their loved ones. “Tonight has been beyond horrific,” he wrote. “I still don’t know what to say but wanted to let everyone know that me and my crew are safe. My Thoughts and prayers go out to everyone involved tonight. It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night. #heartbroken #stopthehate.”

Aldean was the last performer of the three-day festival. Eric Church, Sam Hunt, Jake Owen and Big & Rich are just a few of the other acts that were on the Route 91 Harvest Festival bill.

Artists from across genres took to social media this morning to share their grief and support.

See their messages below.

Las Vegas Metro PD has set up a hotline to assist with anyone searching for missing family and friends. That number is 866-535-5654.

The Vegas police also advise those wishing to donate blood to visit the Labor Health & Welfare Clinic, 7135 W. Sahara Las Vegas, NV 89117.

💔. Vegas, praying for you.

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