Police responded late Sunday night to reports of an active shooter situation at an outdoor country music festival near Mandalay Bay in Las Vegas. In a briefing held just after 3 am ET, a public information officer for the Las Vegas PD said that one suspect is down. He advised everyone to avoid the Las Vegas Strip. From ABC News:

Officials at the University Medical Center in Las Vegas told ABC News that it had at least 20 victims with gunshot wounds right now, with the number expected to grow. The hospital did not provide information on the victims’ conditions…

“They were firing from somewhere high, and they were unloading clip after clip after clip after clip,” a witness told Nathan O’Neal, a reporter for a local news station, KSNV News. “It was hundreds of shots.”