The shooting Friday at a Newtown, Conn. elementary school where as many as 26 people were killed, including 18 children, is the second-worst in U.S. history. Here is a list of other major school shootings.
— April 2, 2012: A gunman killed seven people in a rampage at a California Christian university. Jongjin Kim, the Oikos University, said the suspect, One Goh, was angry because administrators refused to grant him a full tuition refund after he dropped out of the nursing program.
— Feb. 27, 2012: Three students were killed and two wounded in a shooting spree that started in a school cafeteria in Chardon, Ohio, as students waited for buses to other schools. Police have charged T.J. Lane, who was 17 at the time, as an adult.
— Feb. 14, 2008: Former student Steven Kazmierczak, 27, opened fire in a lecture hall at Northern Illinois University in DeKalb, Ill., fatally shooting five students and wounding 18 others before committing suicide.
— April 16, 2007: Seung-Hui Cho, 23, fatally shot 32 people in a dorm and a classroom at Virginia Tech in Blacksburg, then killed himself.
— Oct. 2, 2006: Charles Carl Roberts IV, 32, shot to death five girls at West Nickel Mines Amish School in Pennsylvania, then killed himself.
— March 21, 2005: Jeffrey Weise, 16, shot and killed five schoolmates, a teacher and an unarmed guard at a high school on the Red Lake Indian Reservation in Minnesota before taking his own life. Weise had earlier killed his grandfather and his grandfather's companion.
— Oct. 28, 2002: Robert Flores Jr., 41, who was flunking out of the University of Arizona nursing school, shot and killed three of his professors before killing himself.
— March 5, 2001: Charles "Andy" Williams, 15, killed two fellow students and wounded 13 others at Santana High School in Santee, Calif.
— April 20, 1999: Students Eric Harris, 18, and Dylan Klebold, 17, opened fire at Columbine High School in Littleton, Colo., killing 12 classmates and a teacher and wounding 26 others before killing themselves in the school's library.
— May 21, 1998: Two teenagers were killed and more than 20 people hurt when Kip Kinkel, 17, opened fire at a high school in Springfield, Ore., after killing his parents.
— March 24, 1998: Andrew Golden, 11, and Mitchell Johnson, 13, killed four girls and a teacher at a Jonesboro, Ark., middle school. Ten others were wounded in the shooting.
— 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: Luke Woodham, 16, 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.