Reports of a Las Vegas mass shooting emerged after claims local police are on the hunt for a gunman left at least two people dead after going on a rampage at the packed music festival.
City authorities are investigating reports of an “active shooter” in the world-famous Strip, popular with tourists from the globe.
Dramatic videos posted on social media appears to show the moment the suspected gunman opened fire, as loud noises ring out while music plays.
Bilzerian, who was attending the Route 91 event, posted the shocking moment in which he fled the scene – claiming to have seen a victim shot in the head.
Filming himself, the social media personality said: “Holy f***, this girl just got shot in the f****** head.”
While running, he adds: “So f****** crazy.”
Officials have said “multiple” casualties have been rushed to hospital with gunshots wounds after the attack, which began at around 11pm local time.
University Medical Center spokeswoman Danita Cohen said the Las Vegas hospital is taking in “several” people with gunshot wounds.
Hospital officials have confirmed two people had been killed in the attack and said at least 24 more were being treated for gunshot wounds.
Las Vegas Metropolitan Police Department warned people to avoid the south end of the Strip.
Officers said Las Vegas Boulevard is shut down at Tropicana, southbound past Russell Road.
A spokesman for Las Vegas Police confirmed “one suspect is down” as they continue to operate around the scene.
Some flights into the city’s McCarran International Airport have been diverted due to the incident.
An eyewitness, who was at the Mandalay Bay concert with a friend, said Jason Aldean stopped in the middle of his performance and was rushed off stage.
Ivette Saldana said: “It was a horror show. People were standing around, then they hit the floor.”
Ms Saldana said she fled the scene and hid in a sewer.
Another witness told Sky News: A lot of us have been saying this has been a long time coming and look at us now.
“A lot of people have been shot, it’s horrible, disgusting – makes me sick.”