In Las Vegas, Nevada, a gunman opened fire with an automatic rifle from the 32nd floor of the Mandalay Bay casino hotel Sunday night, killing at least 50 people and injuring more than 200 others at a country music concert below. It was the deadliest mass killing by a single gunman in U.S. history. Videos shared on social media showed a chaotic scene as thousands of panicked concertgoers dove for cover or fled from repeated bursts of rapid gunfire. Police say a SWAT team used an explosive device to break into the hotel room where the shooter had holed up, killing him. Police later identified him as 64-year-old Stephen Paddock, a white male from the Las Vegas area. At the time of this broadcast, police said they had “located” a companion of Paddock’s, Marilou Danley, who’s been described as an “associate” of the shooter. The mass killing came as country music star Jason Aldean performed at the end of the three-day Route 91 Harvest music festival near the end of the Las Vegas Strip.