The deadliest shooting in U.S. history is leaving at least 50 people dead and more than 200 others injured. An armed man opened fire from the 32nd floor of the Mandalay Bay and Casino into a crowd of concert-goers during a country music festival Sunday night on the Las Vegas Strip. The sole gunman, 64-year-old Stephen Paddock, was later killed by police. A federal law enforcement official said a cache of weapons was found inside the hotel room where Paddock died. Las Vegas