Between the 1999 Columbine High School massacre and the 2018 Santa Fe High School shooting in Texas, more than 214,000 students experienced gun violence at 216 schools, and at least 141 children, educators and other people were killed and another 284 were injured.
Schools in at least 36 states and the District of Columbia have experienced a shooting.
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.
70% of the perpetrators of school shootings were under the age of 18, with the median age of 16.
More than 85% of the perpetrators of school shootings obtained their firearms from their own homes or from friends or relatives.
Targeted school shootings, those occurring for example in the context of a feud, or being bullied, were about three times as common as those that appeared indiscriminate. Most perpetrators of school shootings exhibited no signs of debilitating mental disorder, such as psychosis or schizophrenia.
Between the 1999 Columbine High School massacre in Colorado and 2015, "more than 40 people" were "charged with Columbine-style plots;" almost all were white male teenagers and almost all had studied the Columbine attack or cited the Columbine perpetrators Eric Harris and Dylan Klebold as inspiration.
At least 68 schools that experienced a school shooting employed a police officer or security guard; in all but a few, the shooting ended before any intercession.
There were 11 firearm-related events that occurred at a school or campus in the first 23 days of 2018.
As of May 2018, more people, including students and teachers, were killed in 2018 in schools in the United States than were killed in military service for the United States, including both combat and non-combat military service, according to an analysis by The Washington Post.
In terms of the year-to-date number of individual deadly school shootings incidents in the United States, early 2018 was much higher than 2017, with 16 in 2018 and four in 2017, through May; the year-to-day through May number of incidents was the highest since 1999.
As of May 2018, thirteen school shootings took place on K–12 school property in 2018 that resulted in firearm-related injuries or deaths, including 32 killed and 65 injured, according to Education Week.
22 school shootings where someone was hurt or killed occurred in the United States in the first 20 weeks of 2018, according to CNN.