UPDATE: Police say one suspect is down.
At least two people are dead and 24 others hospitalized in a mass shooting Sunday night at the Mandalay Bay hotel and resort on the Las Vegas strip.
The Associated Press reports that of the 24 injured, 12 are in critical condition.
A hospital spokeswoman confirmed to the Los Angeles Times that the casualties were near the Mandalay Bay casino.
Concertgoers at a Route 91 Harvest country music festival performance reported a burst of weapons fire as the concert was underway, The Los Angeles Times reports. Country music star Jason Aldean was reportedly performing when the gunfire erupted, Fox News reports.
A triage center was set up at Las Vegas Boulevard and Tropicana Avenue and multiple emergency vehicles were en route to the scene, reports show.
Reports on the scene say the police presence is heavy and the area has been cordoned off. Other reports say the casinos and facilities in the area are in lockdown.
No further information was immediately known. This is a developing story.