School shootings motivated by bullying

On April 20, 1999, twelfth-grade students Eric Harris and Dylan Klebold murdered 13 students and 1 teacher in a school shooting and attempted bombing at Columbine High School in Columbine, Colorado, United States. Twenty people were injured by the gunfire, and three others were injured while trying to escape. The attack ended when Harris and Klebold died by suicide. The Columbine massacre was the deadliest mass shooting at a K–12 school in U.S. history until the Sandy Hook Elementary School shooting in December 2012. It remains among the most infamous massacres in the United States and the deadliest mass shooting in Colorado. As of June 2025, it had inspired more than 70 copycat attacks, a phenomenon dubbed the Columbine effect, and Columbine has become a byword for modern school shootings.

shooting on the campus of Virginia Polytechnic Institute and State University in Blacksburg, Virginia, United States

2007 School shooting in Tuusula, Finland

2018 school shooting and bombing in Kerch, Crimea

Mass murder in 2011 in Rio de Janeiro, Brazil

2006 mass shooting in Montreal, Canada

school shooting, mass murder, murder–suicide and infanticide in Brazil

school shooting in the Viertola district in Vantaa, Finland, on 2 April 2024

1989 school shooting in Finland

spree shooting at two schools in Aracruz, Brazil

On the morning of October 14 of 2017 a student of the Brazilian private school Goyases open fire against his classmates, leaving two deaths and four injuries.

2025 terrorist attack in Indonesia

April 1999 school massacre attempt in Taber, Alberta, Canada