FIVE FACTS ABOUT MASS SHOOTINGS IN K-12 SCHOOLS - Preventing Mass Shootings in the United States - Evidence Summary

Oct 15, 2026

Evidence-based summary on preventing mass shootings in U.S. K-12 schools drawn from NIJ-sponsored research. It highlights that many perpetrators are in crisis, often leak plans through warning behaviors, and that crisis intervention and school violence prevention approaches may help. It emphasizes community involvement, reporting threats, and using mechanisms such as tip lines and threat assessment. It also notes common warning signs, peer reporting, and firearm acquisition patterns, stressing secure storage and coordinated response.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages2

Reading Time5 min

AccessFree to download

FIVE FACTS

1. Crisis, leaking plans, and opportunities for intervention

2. Everyone can help prevent school mass shootings

3. Threat assessment as a promising prevention strategy

4. Weapon acquisition often involves theft from family members

5. (Content continues beyond provided text)

U.S. Department of Justice Office of Justice Programs National Institute of Justice NATIONAL INSTITUTE OF JUSTICE FIVE FACTS A BOUT MASS SHOOT ING S IN K-12 SCHOOLS Preventing mass shootings in the United States, particularly those occurring in school settings, is an important priority for families, government leaders and officials, public safety agencies, mental health professionals, educators, and local communities. What does the evidence say about how to detect, prevent, and respond to these tragic events? Here’s what we’ve learned through NIJ-sponsored research:1 1. Most people who commit a mass shooting are in crisis leading up to it and are likely to leak their plans to others, presenting opportunities for intervention. Before their acts of violence, most individuals who carry out a K-12 mass shooting show outward signs of crisis. Through social media and other means, they often publicly broadcast a high degree of personal instability and an inability to cope in their current mental state. Almost all are actively suicidal. Case studies show that most of these individuals engage in warning behaviors, usually leaking their plans directly to peers or through social media.2 Yet most leaks of K-12 mass shooting plans are not reported to authorities before the shooting. Research shows that leaking mass shooting plans is associated with a cry for help.3 Analyses of case reports from successfully averted K-12 mass shootings point to crisis intervention as a promising strategy for K-12 mass shooting prevention.4 Programs and strategies found to prevent school shootings and school violence generally could hold promise for preventing school mass shootings as well. 2. Everyone can help prevent school mass shootings. Most individuals who carry out a K-12 mass shooting are insiders, with some connection to the school they target. Often, they are current or former students. Learn more from these NIJ reports: • Understanding the Causes of School Violence Using Open Source Data, [https://nij.ojp.gov/library/publications/](https://nij.ojp.gov/library/publications/)[ ](https://nij.ojp.gov/library/publications/)[understanding-causes-school-violence-using-open-source-data](understanding-causes-school-violence-using-open-source-data) • A Multi-Level, Multi-Method Investigation of the Psycho-Social Life Histories of Mass Shooters, [https://nij.ojp.gov/library/publications/](https://nij.ojp.gov/library/publications/)[ ](https://nij.ojp.gov/library/publications/)[multi-level-multi-method-investigation-psycho-social-life-histories-mass](multi-level-multi-method-investigation-psycho-social-life-histories-mass) • The Causes and Consequences of School Violence: A Review, [https://www.ojp.gov/pdffiles1/nij/302346.pdf](https://www.ojp.gov/pdffiles1/nij/302346.pdf) • A Comprehensive School Safety Framework: Report to the Committees on Appropriations, [https://www.ojp.gov/pdffiles1/nij/255078.pdf](https://www.ojp.gov/pdffiles1/nij/255078.pdf) National Institute of Justice • Strengthen Science • Advance Justice August 2022 NC J 305045 Five Facts About Mass Shootings in K-12 Schools • Research suggests that communities can help prevent school mass shootings by working together to address student crises and trauma, recognizing and reporting threats of violence, and following up consistently. Two-thirds of foiled plots in all mass shootings (including school mass shootings) are detected through public reporting. Having a mechanism in place to collect information on threats of possible school violence and thwarted attempts is a good first step. The School Safety Tip Line Toolkit is one resource to consider for developing and implementing a school tip line.5 The Mass Attacks Defense Toolkit details evidence-based suggestions for recognizing warning signs and creating collaborative systems to follow up consistently in each case.6 The Averted School Violence Database enables schools to share details about averted scho

FAQs

What does the evidence say about perpetrators before a K-12 mass shooting?

Most individuals are in crisis, show outward signs of instability, and are often actively suicidal. Many engage in warning behaviors, including leaking plans to peers or through social media.

Why is leaking a common opportunity for intervention, and what is recommended?

Leaking is associated with a cry for help, and analyses of cases where attacks were averted point to crisis intervention as a promising prevention strategy.

What prevention strategies does the document highlight for schools and communities?

It emphasizes threat assessment protocols, coordinated responses by school teams, and community mechanisms to collect and report threats, such as school tip line toolkits and consistent follow-up systems.

Oct 15, 2026

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