Las Vegas Mass Shooting — 60 Killed, 411 Shot; Deadliest Modern US Mass Shooting

Stephen Paddock fired from the 32nd floor of the Mandalay Bay hotel into the crowd at the Route 91 Harvest country music festival on October 1, 2017, killing 60 and injuring 411 — the deadliest mass shooting in modern US history. Paddock had modified 14 semi-automatic rifles with 'bump stocks' to simulate automatic fire. The FBI closed the investigation without establishing a motive; bump stocks were subsequently banned by the Trump administration in 2018.