The woman who says she witnessed threatening behavior before the Las Vegas shooting. Sky News

In the aftermath of the worst mass shooting in recent US history, one witness said a woman had told the crowd that they were "all going to die tonight."

A concertgoer who attended the Route 91 Harvest festival, where the shooting took place, told Sky News that she saw "a lady who pushed her way forward into the concert venue into the first row."

The witness said "she started messing with another lady and told us that we're all going to die tonight,'" before being escorted out by security about 45 minutes before the shooting.

After that, the witness said she left the concert and headed back to her hotel room. When she heard there had been a shooting, the witness "thought it had a positive correlation to" the woman's warning, she said.

It is unclear, however, whether the incident had any relation to the shooting. The witness described the woman and a man she was with as Hispanic and "five-footers."

"They just looked like everyday people," the witness said.

Police have identified Stephen Paddock, a 64-year-old white man, as the suspected gunman.

His roommate, Marilou Danley, was an initial person of interest to police. Police have said she is out of the country.

The shooting left at least 59 dead and 527 injured. It is believed to be the deadliest mass shooting in modern US history.

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