Police said the “primary aggressor”, named as Stephen Paddock, is dead.
Police said the gunmen, wholived in a retirement community 80 miles from Las Vegas, opened fire on the crowd from the 32nd floor of the Mandalay Bay resort and casino on the Las Vegas Strip.
Eyewitness accounts and footage from the shooting revealed scenes of panic, as the 40,000-strong crowd attempted to escape.
Jake Friedman, who was at the concert, told Sky News: “You could clearly see dozens of bodies piled up on the ground.
“Then we realised people were getting massacred in front of us.”
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A witness told News3LV that “bullets were flying everywhere” as concertgoers fled.
“They were firing from somewhere high and they were unloading clip after clip after clip after clip,” the man said.
“It sounded like some fireworks going off,” a witness told NBC Las Vegas. “And then I think there was like the first kind of volley, then the second volley. Lots of people got hit,” he added.
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A witness, who escaped in her car, told CNN people were “laying on top of each other trying to get out of the way and the shots just kept coming.”
“Everybody was hiding everywhere,” she said. “There was a gentleman that was shot and he said ‘could you help me?’ And so I put him in my car and I had like six people in my car.”
Jason Aldean, the country star who was performing as the shooting took place, has issued a statement.
Writing on Instagram he said: “Tonight has been beyond horrific. I still don’t know what to say but wanted to let everyone know that me and my crew are safe.
“My thoughts and prayers go out to everyone involved tonight. It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night.”