This preliminary study provides an overview of the violent incidents and plots committed or attempted by supporters of al-Qa'ida and associated movements (AQAM) inside the United States since 1990. We focus on these movements because they are widely viewed as posing a great threat to public safety. Data are drawn from the United States Extremist Crime Database.
Freilich, Joshua D., Jeffrey Gruenewald, Steven M. Chermak, and William S. Parkin. 2013. "Al-Qa'ida - Related Terrorism: Violent Incidents and Foiled Plots." College Park, MD: START (April).