Via Handakte WebLAWg, a large set of links about U.S. criminal justice, criminology and so on, auf der Site von Dr. O’Conner, North Carolina Wesleyan College. In particular the college does an online course on forensic criminology, including a terrorism unit.
For the UK, there is a website of the Criminal Justice System. Leeds University has a site with a lot of international links, including links to German police sites.