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LAS VEGAS, NV - OCTOBER 01:  People run from the Route 91 Harvest country music festival after apparent gun fire was heard 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 run from the Route 91 Harvest country music festival after apparent gun fire was heard 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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    Officers hear gunfire approaching killer's room

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Officers hear gunfire approaching killer's room

CNN's Jim Sciutto reports on dispatcher sound of officers hearing gunfire as they hunted down the Las Vegas killer.

Officers hear gunfire approaching killer's room

CNN's Jim Sciutto reports on dispatcher sound of officers hearing gunfire as they hunted down the Las Vegas killer.