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LAS VEGAS, NV - OCTOBER 01:  People tend to the wounded outside the Route 91 Harvest Country music festival grounds after an apparent shooting on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino.  (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 01:  People tend to the wounded outside the Route 91 Harvest Country music festival grounds after an apparent shooting on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino.  (Photo by David Becker/Getty Images)

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Bleeding victims piled into pickup truck

New video shows the aftermath of a mass shooting at a concert in the Mandalay Bay Resort in Las Vegas.

Bleeding victims piled into pickup truck

New video shows the aftermath of a mass shooting at a concert in the Mandalay Bay Resort in Las Vegas.