More than 50 people are confirmed dead and more than 400 injured after a “lone wolf” gunman opened fire during Jason Aldean’s set at the Route 91 Harvest Festival in Las Vegas last night (Oct. 1).

The male suspect, a 64-year-old local resident, has been killed. The suspect fired on the crowd from the 32nd floor of Mandalay Bay.

The three-day Route 91 Harvest festival started Friday and is reported to have attracted 30,000 attendees. The shooting began on the final night, during a performance by Jason Aldean.

After 49 people where killed at Pulse nightclub in Orlando, Fla., in June 2016, this is thought to be the worst mass shooting in U.S. History.

Country music artists who were performing last night at the festival, including Chris Young, Jason Aldean, Jake Owen and more, have posted messages on social media.

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