Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

National Threat Assessment Center Research Videos

Mass Attacks in Public Spaces – 2019

This report examines 34 attacks in public or semi-public spaces, during which three or more people were harmed.