The bombings in Madrid, Spain; al Qaeda cell activities in Milan, Italy; and the Van Gogh murder in the Netherlands.

This episode explores in-depth the phenomenon of homegrown terrorism, examining the bombings in Madrid, Spain, and the connections between those bombers and al Qaeda cell activities in Milan, Italy, and the Van Gogh murder in the Netherlands. Interviews with key officials and intelligence agencies highlight the difficulties governments face in identifying potential terrorists among radical Islamists and in protecting citizens from these internal threats.

Executive producer: Phil Craig, Brook Lapping Productions
Producer: David Alter