Many school shootings in the United States result in one non-fatal injury . The type of firearm most commonly used in school shootings in the United States is the handgun . Three school shootings ( the 1999 Columbine High School massacre in Colorado , the 2012 Sandy Hook Elementary School shooting in Connecticut , and the 2018 Stoneman Douglas High School shooting in Florida ) , accounted for 43 % of the fatalities ; the type of firearm used in the most lethal school shootings was the rifle . High-capacity magazines , which allow the perpetrator to fire dozens of rounds without having to reload , were used in the Columbine High School massacre and the Sandy Hook Elementary School shooting
Columbine High School massacre
Columbine High School massacre
School shooting