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UPDATE [10/2/17, 6:17 p.m. ET]:

The death toll has risen to 59. Upwards of 500 have been reported injured.

UPDATE [10/2/17, 9 a.m. ET]:

According to MSNBC, more than 400 people were hospitalized after the shooting, an increase from the originally reported number of 200. Sheriff Lombardo said during a news conference that he believed the individual killed himself before authorities entered his hotel room. In the hotel room, the suspect had at least 10 rifles, Lombardo said.

More than 50 people died and 400 people were injured after a “lone wolf” gunman unleashed a hail of gunfire on a music festival while singer Jason Aldean was performing in Las Vegas on Sunday night.

The suspect, according to Fox News, was 64-year-old Stephen Paddock of Mesquite, Nevada. Police believe he killed himself after shooting streams of bullets from the 32nd floor of the Mandalay Bay Hotel. He shot into a crowd of 22,000 attendees at around 10:08 p.m. local time, according to the Las Vegas Metropolitan Police Department.

According to MSNBC, concertgoers said they saw muzzle flashes from the hotel. Multiple locations, including rooms in the hotel, were on lockdown. When authorities entered Paddock's room, they reportedly found many weapons. At least one police officer died while attending the concert.

Prior to Sunday, law enforcement was aware of Paddock, but it's unclear what exactly they knew.

Police are searching Paddock's house and have located a person of interest, Marilou Danley, Paddock's “companion”:

Shortly after the shooting, Aldean released a statement on Instagram. “My Thoughts and prayers go out to everyone involved tonight,” he said:

Jason Aldean/Instagram

One witness described a disturbing comment from a woman telling her and others they would die that night:

On social media, video and images emerged from the scene of the shooting:

In response, Nevada politicians issued strong condemnations of the shooting. Nevada Gov. Brian Sandoval called the shooting an “act of cowardice”:

Sen. Dean Heller (R-Nev.) similarly described the shooting as “senseless” and “horrifying”:

President Donald Trump tweeted his “warmest condolences and sympathies” for victims of the shooting:

Vice President Mike Pence tweeted about the shooting, calling it “senseless”:

Trump's daughter, Ivanka, responded on Twitter as well:

The White House is expected to release a statement Monday regarding the shooting.

Watch Sheriff Joe Lombardo of Clark County brief the press below, via MSNBC.