At least 50 were killed and nearly 400 were injured during the Route 91 Harvest Festival in Las Vegas, Nevada. Nearly 22,000 people were in attendance during the event, including an off-duty officer who was one of the fatally shot.
The gunman has been identified as 64-year-old Stephen Paddock, a resident of Mesquite, Nevada. Paddock was shooting from the 32nd floor of Mandalay Bay, a hotel adjacent to the venue. Paddock is rumored to have acted alone, but the investigation is ongoing.