Sandy Hook, Columbine, Blacksburg: 20 years of US school shootings
Florida high school shootings are the latest gun-related massacre in United States
A woman holds a photograph of victims of the December 2012 shooting at Sandy Hook Elementary School. Photoraph: Win McNamee/Getty Images
The shootings at a Florida high school in which 17 peolple have been killed is the the latest outbreak of gun violence that has become a regular occurrence at US schools and colleges.
Below are some of the worst US school shootings in the last 20 years.
Benton, Kentucky, January 23rd, 2018 - A 15-year-old boy kills two fellow students, both also 15, at Marshall County High School in western Kentucky with a pistol and wounds 14 others. Four other high schoolers suffered non-gunshot wounds in the ensuing panic.
Azetec, New Mexico, December 7th, 2017 - A man (21) disguised as a student enters the local high school, kills two students and then shoots himself to death.
San Bernardino, California, April 10th, 2017 - A man dies of a self-inflicted gunshot wound after killing his estranged wife at North Park Elementary School. An 8-year-old student is also shot to death.
Roseburg, Oregon, October 1st, 2015 - A man opens fire on the campus of Umpqua Community College, killing nine people before he is shot dead by police.
Marysville, Washington, October 24th, 2014 - A freshman at Marysville-Pilchuck High School fatally wounds four students in the cafeteria before killing himself.
Santa Monica, California, June 7th, 2013 - A onetime digital media student fatally shoots his father and brother, sets their house on fire, and then kills three people at Santa Monica College. The gunman kills himself.
Newtown, Connecticut, December 14th, 2012 - A man fatally shoots his mother, then kills 20 children and six adults before killing himself at Sandy Hook Elementary School.
Oakland, California, April 2nd, 2012 - A former nursing student kills seven people and wounds three at Oikos University, a Korean Christian college.
Chardon, Ohio, February 27th, 2012 - Seventeen-year-old student at Chardon High School kills three students and wounds three in school cafeteria.
Huntsville, Alabama, February 12th, 2010 - A biology professor at the University of Alabama at Huntsville opens fire during a staff meeting, killing three faculty members and wounding three.
Dekalb, Illinois, February 14th, 2008 - A former graduate student kills five students and wounds 16 at Northern Illinois University before taking his own life.
Baton Rouge, Louisiana, February 8th, 2008 - Nursing student at Louisiana Technical College kills two classmates and herself in a classroom.
Blacksburg, Virginia, April 16th, 2007 - A gunman slaughters 32 people and kills himself at Virginia Polytechnic Institute and State University, popularly known as Virginia Tech.
Nickel Mines, Pennsylvania, October 2nd, 2006 - A gunman kills five girls in a one-room Amish schoolhouse, before killing himself.
Sheperdstown, West Virginia, September 2nd, 2006 - A man (49) shoots himself and his two sons to death during a visit to the campus of Shepherd University.
Red Lake Indian Reservation, Minnesota, March 21st, 2005 - A 16-year-old high school student kills seven people and wounds several others in a shooting rampage after killing two people off-campus. He then kills himself.
Cold Spring, Minnesota, September 24th, 2003 - Fifteen-year-old student fatally shoots a freshman and a senior at Rocori High School.
Tucson, Arizona, October 29th, 2002 - A failing student shoots and kills three professors and then himself at the University of Arizona School of Nursing.
Grundy, Virginia, January 16th, 2002 - A recently dismissed graduate student kills a dean, a professor and a student at the Appalachian School of Law and wounds three others.
Santee, California, March 5th, 2001 - A student at Santana High School kills two students, wounds 13.
Littleton, Colorado, April 20th, 1999 - Two teenagers rampage through Columbine High School, fatally shooting 12 students and a teacher and wounding more than 20 others before killing themselves.
Jonesboro, Arkansas, March 24th, 1998 - Two boys, ages 11 and 13, fire on their middle school from woods, killing four girls and a teacher and wounding 11 others. –Reuters