Sandy Hook, Columbine, Blacksburg: 20 years of USA school shootings

Parkland Florida is the 18th School Shooting in the United States In 2018

Parkland Florida is the 18th School Shooting in the United States In 2018

Gabe Parker, 15, 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.

AZTEC, New Mexico, Dec. 7, 2017 - A 21-year-old man disguised as a student enters the local high school, kills two students and then shoots himself to death.

In October 1991, a man shoots dead 22 people at a restaurant in the town of Killeen, Texas, and then kills himself.

In October 1991, 35-year-old George Hennard, a United States citizen, shot dead 22 people in a restaurant in the town of Killeen before shooting himself.

MARYSVILLE, Washington, Oct. 24, 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.

November 2015: Gunman kills three after storming a Colorado Planned Parenthood clinic; he is arrested after a hourslong standoff with police.

A 20-year-old American citizen, Adam Lanza, killed his mother in December 2012 before shooting and killing 20 children and six adults at Sandy Hook Elementary School in Newtown, Connecticut. It was the deadliest mass shooting at either a high school or grade school in USA history and prompted renewed debate about gun control in the United States.

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. He is sentenced to life in prison.

HUNTSVILLE, Alabama, Feb. 12, 2010 - A biology professor at the University of Alabama at Huntsville opens fire during a staff meeting, killing three faculty members and wounding three.

April 2007: Virginia Tech student kills 32 people before committing suicide.

At the time, it was the deadliest shooting carried out by a lone gunman.

Nickel Mines, Pennsylvania, October 2nd, 2006 - A gunman kills five girls in a one-room Amish schoolhouse, before killing himself.

SHEPHERDSTOWN, West Virginia, Sept. 2, 2006 - A 49-year-old man shoots himself and his two sons to death during a visit to the campus of Shepherd University.

Everytown Research, a nonprofit that tracks shootings and other incidents related to gun safety, said there have been at least 17 other incidents where a gun was sacked on or near USA schools in 2018, including six incidents in which students were either killed or wounded.

A Vietnamese immigrant, Jiverly Antares Wong, shot and killed 13 people at a civic centre in the city of Binghamton in April 2009, before killing himself.

COLD SPRING, Minnesota, Sept. 24, 2003 - Fifteen-year-old student John Jason McLaughlin, 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. He is now serving life in prison.

Two American teenage boys - Eric Harris and Dylan Klebold - shot and killed 12 classmates and a teacher, before killing themselves at Columbine High School in Littleton, Colorado, in April 1999.

November 2009: U.S. Army psychiatrist kills 13 people at Fort Hood, Texas.