• A Study of Active Shooter Incidents in the United States Between 2000 and 2013 (U.S. Department of Justice, Federal Bureau of Investigation). This study is “ intended to provide a baseline to guide federal, state, tribal, and campus law enforcement along with other first responders, corporations, educators, and the general public to a better understanding of active shooter incidents.”  It looks at the characteristics of the 160 active shooter incidents.
  • Active Shooter: Recommendations and Analysis for Risk Mitigation. Prepared by the counterterrorism Bureau of the New York City Police Department (NYPD). This new edition includes an updated analysis and compendium of active shooter incidents (through December 21, 2012), incorporating 43 incidents (including 5 foiled attacks) that occurred in the approximately two-year period since the release of the 2010 Edition.