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What were the causes of 9/11?

Everyone has a theory about the real causes of 9/11. They range from the nutty (it was the US government) to the plausible but flawed (a response to foreign occupation) to the credible (collateral damage from a clash within Islam)

By Peter Bergen   126

No event in recent times has produced as many explanations as the 11th September attacks five years ago. Within the space of an hour, al Qaeda inflicted more direct damage on the US than the Soviet Union had done throughout the cold war, a cataclysm seen by more people than any other event in history. Yet it took only 19 men armed with small knives to destroy the World Trade Centre, demolish a wing of the Pentagon and kill 3,000 people. This mismatch has led some—especially in the Muslim world—to seek a deus ex machina to explain what otherwise appears…

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