American Terrorist | TRAILER | FRONTLINE

Subscribe on YouTube: FRONTLINE investigates American-born terrorist David Coleman Headley, 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. WATCH the full documentary beginning April 21 at 10 pm ET, or online here: