Shooting massacre in Las Vegas

THE LEAD STORY: At least 20 people are dead and more than 100 are injured after a mass shooting during a country music concert in Las Vegas, police say... The gunman, whose identity was not released, is dead. He fired down on the concert from a room inside the Mandalay Bay casino. Police said they are looking for a person of interest believed to be the gunman's roommate, Marilou Danley. Investigators believe the gunman was a "lone wolf" in the shooting. Authorities first received calls about an active shooting at about 10:08 p.m. local time. 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 initially confused for firecrackers. The entire Las Vegas strip was put on lockdown with a massive police response to the scene.(Fox News)