"Significant Incidents of Political Violence Against Americans: 1990, published by the Bureau of Diplomatic Security's Office of Intelligence and Threat Analysis (DS/DSS/ITA), is intended to provide a comprehensive picture of the range of political violence that American citizens and interests have encountered abroad during 1990. In addition to examining terrorism-related acts, this study also includes other instances of violence affecting Americans. This chronology is designed to encompass major anti-U.S. incidents that occurred in 1990. Unfortunately, to keep the publication at the unclassified level, some incidents had to be omitted due to the sensitive nature of the information associated with them. The selection of incidents used in this study was based upon the following criteria: (a) lethality; (b) major property damage; (c) unusual tactics or weapons used; and (d) perceptibility of targets as U.S. or representative of U.S.interests."
Department of State Publication 9869
U.S. Department of Diplomatic Security: http://www.state.gov/