Oct. 1, 1997: A 16-year-old in Pearl, Miss., fatally shoots two students to death and wounds seven others after stabbing his mother to death.
Feb. 19, 1997: A 16-year-old boy takes a shotgun and a bag of shells to school in Bethel, Alaska, and kills the principal and a student and injures two others.
Aug. 15, 1996: A graduate student studying engineering at San Diego State University shoots and kills three professors while he defends his thesis.
Feb. 2, 1996: Two students and one teacher are killed and another is wounded when a 14-year-old student in Moses Lake, Wash., opens fire on his algebra class.
March 23, 1994: A 16-year-old student in Seattle is killed in a gang-related drive-by shooting at the school.
Nov. 1, 1991: A physics graduate student kills five University of Iowa officials and wounds two others. The student then fatally shoots himself.
Aug. 12, 1986: Five people are shot and one killed by a student at New York Technical College in Brooklyn.
Nov. 26, 1985: A high school student in Washington State dies after shooting herself the previous day. Police say the female student earlier shot and killed two 14-year-old boys, one of them her former boyfriend.
Oct. 23, 1985: The dean of Bates College in Maine is shot in the back by a sniper while standing in his kitchen in a house just off campus. The dean survives the shooting, and the captain of the school's swim team is arrested in connection with the incident.
Feb. 22, 1978: After being taunted for his beliefs, a 15-year-old self-proclaimed Nazi, kills one student and wounds a second with a Luger-style pistol in Lansing, Mich.
Dec. 30, 1974: In Olean, N.Y., Anthony Barbaro, a 17-year-old Regents scholar armed with a rifle and shotgun, kills three adults and wounds 11 others at his high school, which was closed for the Christmas holiday. Barbaro was reportedly a loner who kept a diary describing several "battle plans" for his attack on the school.
May 4, 1970: Four students are killed and nine wounded when National Guard soldiers attempt to control an antiwar demonstration at Ohio's Kent State University.
Jan. 17, 1969: Two students are shot and killed at the University of California-Los Angeles during a student meeting.
Aug. 1, 1966: Charles Whitman climbs atop the observation deck at the University of Texas-Austin, killing 16 people and wounding 31 during a 96-minute rampage.