Schools, colleges and universities across the world have been the scenes of multiple shooting incidents in recent years. Below are some of the most serious:
SEPTEMBER 2008 - KAUHAJOKI, FINLAND
Matti Juhani Saari, dressed in black and wearing a ski mask, walks into the Kauhajoki School of Hospitality and shoots dead nine students and a teacher. The 22-year-old trainee chef then shot himself and died later in hospital. He had been questioned by police a week earlier after posting a video online showing himself firing a gun.
FEBRUARY 2008 - CHICAGO, US
Stephen Kazmierczak, 27, opens fire in a crowded lecture hall at Northern Illinois University, killing five students and injuring another 15 before taking his own life. He had been armed with three handguns and a shotgun, carried in a guitar case.
FEBRUARY 2008 - LOUISIANA, US
A 23-year-old nursing student, named later as Latina Williams, kills two fellow students at Louisiana Technical College in Baton Rouge before shooting herself dead.
NOVEMBER 2007 - TUUSULA, FINLAND
Pekka-Eric Auvinen, 18, kills seven fellow students and a teacher at Jokela High School before turning his handgun on himself. Ahead of the massacre, he posted a video on the YouTube site celebrating the fact that he was about to launch an attack.
APRIL 2007 - VIRGINIA, USA
In the worst gun rampage in American history, student Cho Seung-hui kills 32 people at Virginia Tech University before committing suicide. He is later found to have sent a video message to a US television station in which he attempted to justify his actions.
OCTOBER 2006 - PENNSYLVANIA, USA
Charles Carl Roberts kills five girls and injures seven at a small school in a reclusive Amish community in the village of Paradise in Lancaster County. After walking into the school, he orders the boys and teachers to leave before tying up the girls in front of the blackboard and shooting them. He then kills himself.
SEPTEMBER 2006, MONTREAL, CANADA
One woman dies and 19 are injured when a gunman, dressed in black and carrying three weapons, runs amok during lunch hour at Dawson College. Students barricade themselves in classrooms as Kimveer Gill, 25, stalks the corridors. He dies during a gunfight with police officers.
MARCH 2005 - MINNESOTA, USA
Jeffrey Weise, 16, kills his grandfather and his grandfather's partner before heading to Red Lake High School, where he kills a teacher, a security guard and five students during a 10-minute rampage. He then shoots himself dead.
SEPTEMBER 2004 - CARMEN DE PATAGONES, ARGENTINA
Three students are killed and five injured when a 15-year-old boy opens fire with a pistol in a classroom at Islas Malvinas Middle School Number Two. He is then arrested.
APRIL 2002 - ERFURT, GERMANY
An expelled student kills 14 teachers, two students and a policeman during a shooting spree at Gutenberg School which ends with him taking his own life. The worst incident of its kind in Germany in decades, it is described by the then Chancellor, Gerhard Schroeder, as "beyond the powers of the imagination".
APRIL 1999 - COLORADO, USA
Eric Harris 18, and Dylan Klebold, 17, kill 12 students, and a teacher in a meticulously planned attack on Columbine High School in Littleton, Denver. Wearing balaclavas and black clothing, the pair stalk the corridors with firearms and home-made bombs before taking their own lives.
MARCH 1996 - DUNBLANE, SCOTLAND
Thomas Hamilton kills 16 five- and six-year-old children and their teacher during a three-minute killing spree in a primary school gymnasium before shooting himself dead. The attack sparks a huge outcry in the UK and leads to laws making it illegal in the UK to buy or possess most types of handguns.