FACTBOX: Major shootings inside schools or universities

(Reuters) - Police and university authorities faced pressure on Tuesday to explain how a gunman apparently evaded detection after killing two people and then went on to kill 30 others two hours later in America's worst shooting rampage.

Here are some details of some of the major shootings inside schools and universities around the world in recent years:

March 1996 - BRITAIN - A gunman burst into a primary school in Dunblane in Scotland and shot dead 16 children and their teacher before killing himself.

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

March 1998 - USA - At Westside Middle School in Jonesboro, Arkansas, two boys aged 13 and 11 set off the fire alarm and killed four students and a teacher as they left the school.

May 1998 - USA - In Springfield, Oregon, a student opened fire in Thurston High School, killing two students and injuring 22. The boy's parents were later found slain in their home.

April 1999 - USA - Two student gunmen killed 12 other students and a teacher at Columbine High School in Littleton, Colorado, before killing themselves.

June 2001 - JAPAN - Mamoru Takuma, armed with a kitchen knife, entered the Ikeda Elementary School near Osaka and killed eight children. Takuma was executed in September 2004.

January 2002 - USA - 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.

February 2002 - GERMANY - In Freising, in Bavaria, a former student thrown out of trade school shot three people before killing himself. Another teacher was injured.

April 26, 2002 - GERMANY - In Erfurt, eastern Germany, a gunman opened fire after he said he was not going to take a maths test . A total of 18 people died, including the assailant.

September 1, 2004 - RUSSIA - 333 hostages - at least 186 of them children - died in a chaotic storming of School No.1 in Beslan, after it was seized by rebels demanding Chechen independence.

March 21, 2005 - USA - A 16-year-old high school student shot dead five students a teacher, and a security guard at the same school at Minnesota's Red Lake Indian Reservation. He had also killed his grandfather and his grandfather's companion elsewhere on the reservation.

September 13, 2006 - CANADA - Kimveer Gill opened fire on the street and inside the college in Montreal's Dawson College killing one student and injured 19 others. Gill killed himself after a battle with police.

October 2, 2006 - USA - Charles Carl Roberts, a dairy truck driver with a grudge, attacked a one-room Amish school in rural Pennsylvania, shot ten girls, killing five of them, before killing himself.

November 20, 2006 - GERMANY - An 18-year old former pupil opened fire after storming the Scholl school in the town of Emsdetten. Eleven people were wounded before he committed suicide.

April 16, 2007 - USA - A gunmen attacked and killed 32 people wounding 15 others at Virginia Tech University in the deadliest campus shooting in U.S. history.