Hundreds of police responded late Sunday to reports of gunfire near the Mandalay Bay casino during a country music festival. A University Medical Center spokesman said there were at least two dead and 24 injured. One suspect is "down," police said. Police do not believe there was another shooter. Country music star Jason Aldean was performing during the Route 91 Harvest Festival when the gunfire erupted. One witness told KSVN that he heard "hundreds of shots." The gunfire was rapid and reportedly confused with firecrackers.The area is now on lockdown. All clubs and businesses on the strip are closed. University Medical Center spokeswoman Danita Cohen said the Las Vegas hospital is taking in people with gunshot wounds. She didn't have any more immediate information.