Here's the National Counterterrorism Centers’ website. There's a detailed report for 2007, far too long to read in a single sitting, which might be helpful to you. The search engine ‘hits’ for the FBI reports, were limited to finding the overall figures (14,000 terrorist incidents/20,500 deaths) but the blame was nonspecific.
http://www.nctc.gov/
The U S State Departments’ website may be useful to your quest. The data is for the year 2006.
http://www.state.gov/s/ct/rls/crt/2006/