The "National Counterterrorism Center Reports" provide statistical analysis and incident summaries in conjunction with the "Country Reports on Terrorism" released by the U.S. Department of State. Through understanding the trends, distribution, and target selection of terrorists in previous attacks, planners and researchers can develop better responses and preparation against future incidents.
Naval Postgraduate School (U.S.). Center for Homeland Defense and Security. Homeland Security Digital Library: https://www.hsdl.org/