Las Vegas Route 91 Harvest Festival Shooting (2017)

The gunman fired over 1,000 rounds from a 32nd-floor hotel room for 11 minutes, with police unable to locate him for 72 minutes after the first shot. Post-incident analysis found that only 5% of U.S. outdoor venues had elevated-threat response plans, and MGM Resorts settled lawsuits for $800 million. The incident remains the deadliest mass shooting in modern U.S. history.