April 2007: At least 22 people are killed as a gunman goes on the rampage at the campus of Virginia Tech

October 2006: A 32-year-old gunman goes on the rampage at an Amish school in Pennsylvania, shooting dead at least three girls before killing himself

September 2006: A gunman in Colorado shoots and fatally wounds a teenage schoolgirl, and then kills himself

September 2006: Two days later a teenager kills the headteacher of a school in Cazenovia, Wisconsin

November 2005: Student in Tennessee shoots dead an assistant principal and wounds two other administrators

March 2005: Schoolboy in Minnesota kills nine, and then shoots himself

May 2004: Four people are injured in a shooting at a school in Maryland

April 2003: Teenager shoots dead a head-teacher at a Pennsylvania school, and then kills himself

January 2002: A student who had been dismissed from the Appalachian School of Law in Grundy, Virginia, killed the dean, a professor and a student, and wounded three others.

March 2001: A pupil kills two students after opening fire at a school in California

February 2000: A classmate shoots dead a six-year-old girl in Michigan.

November 1999: A 13-year-old girl is murdered by a classmate in New Mexico, again via a shooting.

May 1999: Six are injured by a student in a shoot-out in Georgia.

April 1999: Two teenagers shoot dead 12 students and a teacher before killing themselves at Columbine School in Colorado. An award-winning documentary was later made about the killing.

June 1998: Two adults are hurt in shooting by teenage student at high school in Virginia

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