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The grounds are shown at the Route 91 Harvest festival, with the Mandalay Bay Hotel behind the stage, on Las Vegas Boulevard South in Las Vegas, Nevada, Oct. 1, 2017.

People seek shelter at the Route 91 Harvest country music festival after gun fire was heard on October 1, 2017 in Las Vegas, Nevada.

People run from the Route 91 Harvest country music festival after gun fire was heard on October 1, 2017 in Las Vegas, Nevada.

People take care of the wounded outside the Route 91 Harvest Country music festival grounds after a shooting on Oct. 1, 2017 in Las Vegas, Nevada.

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 October 1, 2017 in Las Vegas, Nevada.

Police officers advise people to take cover near the scene of the shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas.

A body is covered with a sheet in the intersection of Tropicana Avenue and Las Vegas Boulevard South after a mass shooting at a music festival on the Las Vegas Strip in Las Vegas, Nevada, Oct. 1, 2017.

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, U.S.