American Terrorist: Could the '08 Mumbai Attack Have Been Prevented?

FRONTLINE investigates Pakistani-American terrorist David Coleman Headley (Dawood Sayed Gilani) who helped plan the deadly 2008 siege on Mumbai. In collaboration with ProPublica, the film — an updated and expanded version of A Perfect Terrorist — reveals how secret electronic surveillance missed catching the Mumbai plotters, and how Headley planned another Charlie Hebdo-like assault against a Danish newspaper.