• Las Vegas, October 1, 2017: A lone wolf gunman kills at least 58 people, injures 515 after shooting people from a high-rise Las Vegas hotel
• Orlando, June 12, 2016: A gunman fatally shoots 49 people at gay nightclub Pulse before he is shot dead by police
• Virginia Tech, April 16, 2007: A gunman slaughters 32 people and kills himself at Virginia Tech, a university in Blacksburg, Virginia
• Sandy Hook, December 14, 2012: A man shoots dead his mother, then kills 20 children, six adults and himself at Sandy Hook Elementary School in Newtown, Connecticut
• San Bernardino, December 2, 2015: A husband and wife kill 14 people at a workplace holiday party in San Bernardino in Southern California before dying in a shootout with police
• Columbine, April 20, 1999: Two teenagers rampage through Columbine High School in Littleton, Colorado, shooting dead 12 students and a teacher and wounding more than 20 others before killing themselves
• Binghamton, April 3, 2009: A Vietnamese immigrant opens fire at an immigrant services centre in Binghamton, New York, killing 13 people and wounding four. He then kills himself
• Fort Hood, November 5, 2009: An army major and psychiatrist opens fire at Fort Hood, a US Army base in Texas, killing 13 people. He is sentenced to death
• Washington DC, September 16, 2013: A former Navy reservist working as a government contractor kills 12 people at the Washington Navy Yard. He is shot dead by police
• Colorado, July 20, 2012: A masked gunman kills 12 people and wounds 70 when he opens fire at a midnight premiere of Batman film The Dark Knight Rises in Aurora, Denver. He receives a life sentence
• Washington DC, October 2002: Two men ambush 13 people, killing 10 of them, in sniper-style shootings that terrorise the Washington area for three weeks. One sniper was executed and the other was sentenced to life in prison
• Oregon, October 1, 2015: A man opens fire on the Umpqua Community College campus in southwest Oregon, killing nine people before he is shot dead by police
• Charleston, June 17, 2015: A white supremacist kills nine black churchgoers at a historic, predominantly black church in Charleston, South Carolina
• Waco, May 17, 2015: Rival motorcycle gangs kill nine at a restaurant in Waco, Texas. More than 170 people are arrested
• Wisconsin, August 5, 2012: A white supremacist kills six worshippers in a Sikh temple in Oak Creek, Wisconsin. The gunman kills himself
• Tucson, January 8, 2011: Then-US representative Gabrielle Giffords is the target of an assassination attempt by a gunman in Tucson, Arizona. Six people are killed and 13, including Giffords, are wounded
• Amish school, October 2, 2006: A gunman kills five girls in a one-room Amish schoolhouse in Nickel Mines, Pennsylvania, before killing himself.
- AAP