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A gunman turned a Las Vegas concert into a killing field Sunday night, murdering at least 50 people and injuring more than 200 others.

The suspect was identified as 64-year-old Stephen Paddock and authorities said they were "confident" Paddock's roomate, Marilou Danley, had been located. Officials previously described Danley as a person of interest.

Shooting in Las Vegas. People fleeing (video from the Mandalay Bay hotel) pic.twitter.com/hs98J5uK6T

— Eiki Hrafnsson (@EirikurH) October 2, 2017

Authorities said one on-duty officer was in critical condition and another was wounded in the shooting. Two off-duty police officers attending the concert were killed.

The gunman, who fired down on the concert from a room on the 32nd floor of the Mandalay Bay Hotel and Casino, was killed by police.

Clark County Sheriff Joseph Lombardo said authorities did not release the suspect's name but said he is a local resident. Lombardo said authorities believe this was a "lone wolf" attack but said they were looking for a roommate of the dead suspect as a person of interest.

Marilou Danley was described as an Asian female, about 4'11 and 111 pounds. Authorities told the public to keep an eye out for a Hyundai with a Nevada plate: 114B40 and a Chrysler with a Nevada plate 19D401.

Authorities first received calls about an active shooting at about 10:08 p.m.

Country music star Jason Aldean was performing at the Route 91 Harvest Festival when the gunfire erupted.

Aldean was performing his last song of the night. Initially, those in attendance said they thought the sound was firecrackers. But as the shots continued, Aldean stopped singing and some concertgoers could be heard yelling to each other to get down.

One witness told KSVN that he heard “hundreds of shots.” The gunfire was rapid and reportedly confused with firecrackers.

Marilou Danley is being sought for questioning re the investigation into the active shooter incident. If seen please call 9-1-1! pic.twitter.com/Z83XvcHejH

— LVMPD (@LVMPD) October 2, 2017

"It sounded like a machine gun," one vendor told Fox News. "It sounded like more than one machine gun."

Authorities said law enforcement swarmed the hotel and killed the gunman in a room on the 32nd floor.

Some concertgoers stayed behind to offer help to those around them.

“Everybody I saw breathing, I helped.” a concertgoer told Fox News.

Kodiak Yazzi, 36, said the music stopped temporarily and started up again before another round of pops sent the performers ducking for cover and fleeing the stage.