At least two people were killed and 24 others injured when an attacker opened fire at a music festival here, according to police and witnesses.
The victims died early Monday morning after they were admitted to the University Medical Centre following the shooting at around 10.30 p.m. in the Route 91 Harvest festival near the Mandalay Bay Casino on the city's Strip, a hospital spokesperson confirmed to CNN.
Out of the 24 injured, 12 were critical, she added.
The Las Vegas Police Department announced that they were not looking for additional shooters at this time.
Earlier they said one suspect was "down" without giving further details.
Large numbers of ambulances and police cars continued to head to the scene of the shooting.
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A video posted on Twitter showed the shooting outside the casino. What sounds like automatic gunfire can be heard, as well as the screaming of the crowd.
Facebook has initiated its Safety Check feature for "the violent incident in Las Vegas, Nevada", so people in the area can tell their friends and relatives they are safe.
A witness told CNN that she helped drive an injured man to the hospital in her car.
She said the whole incident was "insane", adding: "There are crazy people out there."
Another witness said there was "complete chaos" following the incident.
Flights to and from the city's McCarran International Airport have been temporarily halted.
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