This World

World's Richest Terror Army (2015x6)

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The inside story of how a small band of fanatical jihadi fighters became the world's richest terror army ever. Featuring the first major TV interview with an imprisoned senior leader of the so-called Islamic State, Peter Taylor looks behind its medieval savagery and investigates how it became so fabulously rich and resilient. Part of a season of films on BBC Two about the Islamic State.