Worst US mass shootings
1-Mandalay Bay casino
over 58 killedA gunman opened fire on an open-air music festival in Las Vegas, killing at least 58 and injuring over 500.
49 killedA heavily-armed gunman opened fire inside a gay nightclub in the city of Orlando on 12 June 2016 and killed 49 people.
The attacker was shot dead by police; he pledged allegiance to the Islamic State group, which later claimed responsibility.