Jan. 17, 1989
Cleveland Elementary – Stockton
A shooter opened fire on a schoolyard, killing five children and wounding 29, then ended his life.
Weapon: AK-47 Assault Rifle (legally obtained)
May 1, 1992
Lindhurst High School – Olivehurst, Calif.
A former student terrorized the high school, killing four and wounding 15 in retaliation of a failing grade. He later surrendered to police.
Weapons: pump-action 12-gauge shotgun, .22-caliber rifle
Aug. 15, 1996
San Diego State University – San Diego, Calif.
A graduate student murdered three professors during a master’s thesis defense.
Weapon: 9mm semiautomatic handgun
April 20, 1999
Columbine High School – Littleton, Colo.
Two students begin shooting after their explosives failed, killing 12, and wounding 21. The shooters committed suicide before SWAT arrived.
Weapons: semiautomatic TEC DC9 handgun, 2 shotguns, rifle, explosives (Obtained from friends, illegally)
March 5, 2001
Santana High School – Santee, Calif.
A Santee student shot two dead and injured 13, in response to bullying, before being apprehended by police.
Weapon: .22-caliber long-barrel revolver (taken from father)
Jan. 30, 2006
Mail processing plant – Goleta, Calif.
A female shooter with a history of mental illness shot and killed seven people before committing suicide.
Weapon: 9mm semiautomatic pistol
April 16, 2007
Virginia Tech University – Blacksburg, Va.
An undergraduate barricaded himself in a science building, shot 33 dead, and wounded 15 before committing suicide.
Weapons: Glock 19, Walther P22 pistol (legally obtained)
Feb. 14, 2008
Northern Illinois University – DeKalb, Ill.
A former student opened fire on an auditorium killing four and wounding 18.
Weapons: Glock 19, 12-gauge shotgun, 9mm semiautomatic pistol, .38-caliber semiautomatic pistol (purchased legally)
Jan. 8, 2011
A shooter identified as being paranoid schizophrenic attempted the assassination of Congresswoman Gabrielle Giffords during a public event. He killed six others and wounded 13, including Giffords.
Weapon: Glock 19
July 20, 2012
Aurora, Colo.Twelve were killed and 58 wounded when a shooter opened fire on a movie theater.
Weapons: AR-15 rifle, pump-action 12-gauge shotgun, two Glock 22 pistols (all purchased legally)
Dec. 14, 2012
Sandy Hook Elementary – Newtown, Conn.
A Shooter broke through security and attacked classrooms, killing 20 children and six school personnel.
Weapons:10mm Glock, Sig Sauer semi-automatic pistol, .223-caliber semiautomatic rifle (obtained from mother)