New Toolkit for Preventing Mass Shootings and Other Attacks

NIJ-funded researchers created a toolkit to help reduce the likelihood of mass shootings and other public attacks, and reduce the casualties of completed attacks.    After studying 600 mass attack events and plots, interviewing dozens of experts and reviewing hundreds of references, the team identified the Mass Attacks Defense Chain, a series of defenses which work together to reduce the probability of mass attacks and their impacts.

In this toolkit, researchers describe the most important tips they found to help reduce the likelihood and casualties of mass attacks. They also point to key guidance and resources to provide more detailed information.

To access the toolkit, visit