Beginning in November 2011, the START Consortium headquartered at the University of Maryland began collecting original data for the Global Terrorism Database (GTD). The GTD now includes information on 104,688 terrorist attacks from around the world from 1970 through 2011. This report focuses on the U.S. segment of the GTD. For each GTD incident, information is included on the date and location of the incident, the weapons used and nature of the target, the number of casualties, and when available, the group or individual responsible for the incident. In total, 2,608 terrorist attacks occurred in the United States between 1970 and 2011. In this report, we describe longitudinal trends in terrorism in the United States and its spatial distribution at the country, state and city levels. We also examine the weapons and tactics used in these attacks, as well as their targets and perpetrators.
LaFree, Gary, Laura Dugan, and Erin Miller. 2012. “Integrated United States Security Database (IUSSD): Terrorism Data on the United States Homeland, 1970 to 2011.” Final Report to the Resilient Systems Division, DHS Science and Technology Directorate, U.S. Department of Homeland Security. College Park, MD: START (December).