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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.

Jan. 17, 1969: Two students are shot and killed at the University of California–Los Angeles during a student meeting.

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.

1974: A 17-year-old Regents scholar brings guns and homemade bombs to his college, then kills three adults and wounds 11 others from his sniper post on the top floor.

1978: A 15-year-old in Lansing, Mich., kills one bully and wounds a second.

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 survived the shooting, and the captain of the school's swim team was arrested in connection with the incident.

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.

Aug. 12, 1986: Five people are shot and one killed by a student at New York Technical College in Brooklyn.

Nov. 1, 1991: A physics graduate student kills five University of Iowa officials and wounds two others. The student then fatally shot himself.

March 23, 1994: A 16-year-old student in Seattle is killed in a gang-related drive-by shooting at the school.

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.

Aug. 15, 1996: A graduate student studying engineering at San Diego State University shoots and kills three professors while he defends his thesis.

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.

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.

Dec. 1, 1997: Three students are killed and five wounded by a 14-year-old student at Heath High School in West Paducah, Ky.

Dec. 15, 1997: Two students in Stamps, Ark., are wounded by a 14 year-old boy who was hiding in the woods when he shot the students as they stood in the parking lot.

March 24, 1998: Two boys, 11 and 13, fire on their Jonesboro, Ark., middle school from nearby woods, killing four girls and a teacher and wounding 10 others.

April 24, 1998: A 15 year-old student opens fire at an eighth-grade dance in Edinboro, Pa., killing a science teacher.

May 19, 1998: Three days before his graduation, an 18-year-old honor student opens fire at a high school in Fayetteville, Tenn., killing a classmate who was dating his ex-girlfriend.

May 21, 1998: Two teenagers are killed and more than 20 people hurt when a teenage boy opens fire at a high school in Springfield, Ore., after killing his parents.

June 15, 1998: One teacher and one guidance counselor are wounded by a 14-year-old boy in a Richmond, Va., school hallway.

Apr. 20, 1999: Eric Harris, 18, and Dylan Klebold, 17, kill 12 students and a teacher and wound 23 others before killing themselves at Columbine High School in Littleton, Colo.

Nov. 19, 1999: A 13-year-old girl is shot in the head by a 12-year-old boy in school at Deming, N.M.

Feb. 29, 2000: A 6-year-old boy shoots and kills a 6-year-old classmate at Buell Elementary School in Mount Morris Township, Mich.

March 10, 2000: Two students in Savannah, Ga., are killed by a 19-year-old student while leaving a dance sponsored by Beach High School.

May 26, 2000: A 13-year-old student kills his English teacher on last day of classes in Lake Worth, Fla., after the teacher refused to let him talk with two girls in his classroom.

Aug. 28, 2000: A graduate student at the University of Arkansas is found dead with his English professor in an apparent murder-suicide.

March 5, 2001: A 15-year-old student kills two fellow students and wounds 13 others at Santana High School in Santee, Calif., in San Diego County.

Jan. 16, 2002: A graduate student at the Appalachian School of Law shoots and kills the dean, a professor, and a student and wounds three other students.

Oct. 28, 2002: A student at the University of Arizona Nursing College kills three of his instructors before killing himself.

Sept. 24, 2003: A 15-year-old student fatally shoots two fellow students at Rocori High School in Cold Spring, Minn.

April 24, 2003: A 14-year-old student shoots and kills the principal of Red Lion Area Junior High School in south-central Pennsylvania, before killing himself.

March 21, 2005: A 16-year-old student shoots and kills five schoolmates, a teacher, and an unarmed guard at Red Lake High School on the Red Lake Indian Reservation in Minnesota before taking his own life.

Nov. 8, 2005: A high school freshman is arrested in the fatal shooting of an assistant principal and wounding of two other school administrators at Campbell County High School in eastern Tennessee.

Sept. 27, 2006: A 53-year-old gunman takes six girls hostage at Platte Canyon High School in Bailey, Colo. The gunman uses the girls as human shields for hours before fatally wounding a 16-year-old and then killing himself.

Sept. 29, 2006: A 15-year-old student brings two guns to Weston Schools in rural Cazenovia, Wis., and fatally shoots his principal after the principal had given him a disciplinary warning for having tobacco on school grounds.

Oct. 2, 2006: A gunman kills at least four people, including himself, and wounds more at a one-room Amish schoolhouse in Lancaster County, Pa.

Sept. 2, 2006: Douglas Pennington, 49, kills his two sons and himself while visiting Shepherd University in West Virginia.

April 2, 2007: A program coordinator for the University of Washington's College of Architecture is shot and killed by a man in an apparent murder-suicide.