Inside Europe's fight against the rise of Islamist terrorism.

FRONTLINE and ProPublica go inside Europe’s fight against terrorism — the missed warnings and the lingering vulnerabilities.

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Main Cast: Sebastian Rotella, Priyanka Boghani, Sarah Childress, Will Lyman

Director: Ricardo Pollack

Writers: Daniel Edge, Ricardo Pollack, Sebastian Rotella

Editors: Tom Dixon-Spain, Graham Taylor

Cinematographer: Brendan Easton

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