UPDATE: A spokesperson for the Las Vegas Metropolitan Police Department has updated the victim count to 58 dead and more than 515 wounded.

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A shooting in Las Vegas during a country music festival has left at least 50 people dead and more than 400 injured in what is being called the worst mass shooting in modern American history.

In a report from NBC News, Stephen Paddock, 64, of Mesquite, Nevada, fired down on a crowd of over 22,000 people attending the Route 91 Harvest festival at the Las Vegas Village, from the 32nd floor of the Mandalay Bay Resort and Casino. Authorities said they found "multiple" weapons in Paddock's room after using explosives to enter, although it was not revealed what kind of weapons were found.

Authorities are also unsure if Paddock checked into the hotel and if he had specifically requested a room on a high floor that overlooked the concert venue. A search of Paddock's home is currently underway, with officers having located Paddock's roommate, Marilou Danley, 62, in the process. Officers also found two vehicles related to the investigation: a Hyundai Tuscon and a Chrysler Pacifica Touring, both with Nevada license plates.

The shooting took place while Jason Aldean was performing onstage.

"We heard what sounded like firecrackers going off. Then all of a sudden we heard what sounded like a machine gun. People started screaming that they were hit...When we started running out there were probably a couple hundred [people] on the ground," witness Meghan Kearney said.

"People kept dropping and dropping...People were getting shot one foot away from us," Kearney added. "People were trying to save their friends. There were gunshots everywhere. Helping them would've meant that we got shot, too."

Donald Trump sent out a tweet offering his condolences Monday morning, writing: "My warmest condolences and sympathies to the victims and families of the terrible Las Vegas shooting. God bless you!"

Mandalay Bay tweeted out a statement following the incident, writing: "Our thoughts & prayers are with the victims of last night's tragic events. We're grateful for the immediate actions of our first responders."

On Monday morning Trump addressed the shooting at the White House, calling it an "act of pure evil." During the address, Trump also announced that he would be traveling to Las Vegas on Wednesday to meet with first responders, law enforcement officials, and the families of victims.

Source: nbcnews.com