History of school shootings

Detailed below are some of the worst incidents of the past decade.

Scotland, March 1996: Gun enthusiast Thomas Hamilton shoots 16 children and their teacher dead at their primary school in Dunblane, Scotland before killing himself.

Yemen, March 1997: A man with an assault rifle attacked hundreds of pupils at two schools in Sanaa, Yemen, killing six children and two others. He was sentenced to death the next day.

United States, October 1997: A 16-year-old boy fatally stabbed his mother before shooting dead two students, including his former girlfriend, at Pearl High School in Pearl, Mississippi.

United States, December 1997: A 14-year old boy killed three students attending a prayer meeting at Heath High School in West Paducah, Kentucky.

United States, March 1998: Two boys aged 13 and 11 killed four pupils and a teacher after setting off fire alarms at Westside Middle School in Jonesboro, Arkansas.

United States, April 1999: Dylan Klebold and Eric Harris killed 12 of their classmates and a teacher at Columbine High School in Littleton, Colorado, before killing themselves.

Germany, November 1999: A 15-year-old student in Meissen, eastern Germany, stabbed his teacher to death after taking bets from classmates he would dare commit the crime.

He was later jailed for seven years.

Germany, March 2000: A 16-year-old pupil at a private boarding school in the Bavarian town of Branneburg, shot a 57-year-old teacher, who later died from injuries.

The teenager - who also shot himself - was facing expulsion from school after failing a cannabis test.

Germany, February 2002: A former pupil killed his headmaster and set off pipe bombs in the technical school he had recently been expelled from in Freising near Munich.

The man also shot dead his boss and a foreman at the company he worked for before turning the gun on himself. Another teacher was shot in the face, but survived.

Germany, April 2002: Seventeen people killed after a gunman - a former pupil - opens fire in a school in Erfurt, eastern Germany. He then turned the gun on himself.