Oak Creek, Wis.: A white supremacist shoots six people and a responding policeman at a Sikh temple before shooting himself in the head in August 2012.
Aurora, Colo.: Lone gunman kills 12 and injures 58 at a July 2012 screening of “The Dark Knight Rises.”
Oakland, Calif.: A former student at a Christian college fatally shoots seven people and injures three in April 2012.
Copley Township, Ohio: A man in a family dispute uses his handgun to shoot and kill his girlfriend and six others in August 2011.
Geneva, Ala.: Eleven victims, ages 18 months to 74 years old, are killed by a lone gunman in a violent family feud in March 2009.
Omaha, Neb.: A 19-year-old man shoots nine people at a department store in December 2007 before cops kill him.
Blacksburg, Va.: A student at Virginia Tech kills 32 classmates and wounds 25 before committing suicide in April 2007.
Red Lake, Minn.: A 16-year-old boy kills 11 people, including his grandfather and his grandfather’s girlfriend, in a shooting spree in March 2005.
Columbus, Ohio: A deranged fan shoots a Pantera guitarist at a concert as he performs onstage, then fires at fans, killing four people in December 2004.
Wash., D.C.: Two deranged snipers go on a spree, killing 10 people around D.C. and Virginia in Oct. 2002.
Columbine, Colo.: Two senior students invade their school in April 1999, killing 12 students and one teacher and injuring 21, before committing suicide.
Killeen, Texas: An unemployed man drives a truck through a packed cafeteria and fatally shoots 23 people and injures 20 before killing himself in October 1999.
Jacksonville, Fla.: A man angry over a repossessed car storms into the agency in June 1990 and over two days shoots 11 of its 86 employees before killing himself.