GTD – Global Terrorism Database
From the homepage:
The Global Terrorism Database (GTD) is an open-source database including information on terrorist events around the world from 1970 through 2010 (with annual updates planned for the future). Unlike many other event databases, the GTD includes systematic data on domestic as well as international terrorist incidents that have occurred during this time period and now includes more than 98,000 cases.
While chasing down a paper that didn’t make the cut I ran across this data source.
Lacking an agreed upon definition of terrorism (see Chomsky for example), you may or may not find what you consider to be incidents of terrorism in this dataset.
Never the less, it is a dataset of events of popular interest and can be used to attract funding for your data integration project using topic maps.