President Joe Biden on Saturday marked five years since a gunman killed 60 people while firing from a window at the Mandalay Bay casino in Las Vegas. Gunman Stephen Paddock fired more than 1,000 bullets from his suite on the hotel's 32nd floor, killing concertgoers at the Route 91 Harvest Festival, on October 1, 2017, in what remains the single deadliest mass shooting in modern United States history. In a ...