On the morning of Tuesday, September 11, 2001, four commercial airliners were hijacked above the US by the militant Islamist terrorist group al-Qaeda. What followed was the deadliest terrorist attack in history. Twenty years on, Dominic Sandbrook and Tom Holland look back at the events and discuss their impact.

A Goalhanger Films & Left Peg Media production

Produced by Jack Davenport

Exec Producer Tony Pastor

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