An increase in terror incidents involving Islamic radicals who are U.S. citizens is vexing law enforcement officials and posing new questions about the roots of their radicalization.

The prosecution of alleged terrorists in U.S. civilian criminal courts and in new military tribunals has been fraught with controversy. U.S. federal courts have gradually asserted their role in the m…

This publication is now archived. What is a “dirty bomb”?A “dirty bomb,” also known as a radiological weapon or a readiological dispersal device (RDD), is a conventional explosive packaged with radio…