LAS VEGAS, NV - OCTOBER 01:  People scramble for shelter at the Route 91 Harvest country music festival after apparent gun fi
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Terror struck a Las Vegas country-music festival in what is being reported as the United States' worst mass shooting in modern-day history.

During Jason Aldean's headlining set at Vegas' Route 91 Harvest Festival, a gunman identified as Stephen Paddock took aim at the crowd from the 32nd floor of the Mandalay Bay Hotel and Casino. Reportedly using an automatic weapon, the 64-year-old killed more than 50 people, injuring more than 500 injured according to the latest reports on the horrifying incident with the numbers growing. The festival grounds were adjacent to Mandalay Bay's location at the Southern end of the Vegas Strip.

Paddock, was later found dead by officers in the hotel with more than 10 rifles in his possession. Police believe Paddock was a "lone wolf" and did not give details on Paddock's background or motivation. "We have no idea what his belief system was," Sheriff Joseph Lombardo said during a briefing in Vegas, per The Washington Post. "Right now, we believe he was the sole aggressor, and the scene is static."

Stay tuned to Fuse for more on this developing story.