Dec. 1, 1997: Three students were killed and five wounded at a high school in West Paducah, Ky. Michael Carneal, then 14, later pleaded guilty but mentally ill to murder and is serving life in prison.
Oct. 1, 1997: Sixteen-year-old Luke Woodham of Pearl, Miss., fatally shot two students and wounded seven others after stabbing his mother to death. He was sentenced the following year to three life sentences.
Aug. 15, 1996: Frederick Martin Davidson, 36, a graduate engineering student at San Diego State, is defending his thesis before a faculty committee when he pulls out a handgun and kills three professors.
Nov. 15, 1995: Jamie Rouse kills a student and a teacher at Richland High School in Lynnville, Tenn.
Nov. 1, 1991: Gang Lu, 28, a graduate student in physics from China, reportedly upset because he was passed over for an academic honor, opens fire in two buildings on the University of Iowa campus. Five University of Iowa employees killed, including four members of the physics department, two other people are wounded. The student fatally shoots himself.
May 20, 1988: Armed with three guns, Laurie Wasserman Dann, 30, walked into Hubbard Woods Elementary School in the affluent Chicago suburb of Winnetka, Ill. There she shot one pupil in a washroom before invading a second-grade classroom, where she shot five other pupils, one fatally.
May 4, 1970: Four students were killed and nine wounded by National Guard troops called in to quell anti-war protests on the campus of Kent State University in Ohio.
Aug. 1, 1966: Austin, Texas, Charles Joseph Whitman, a 25-year-old architectural engineering honor student at the University of Texas, climbed to the top of the university's 27-story tower and shot 44 people. The 90-minute shooting rampage was ended when Romero Martinez, an off-duty policeman, climbed the tower and shot Whitman, who died immediately. Authorities later found the bodies of the gunman's mother and his wife at their homes.
Information compiled from various local news sources and wire reports.