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Kenya siege: BBC reveals how militants carried out attack

27 September 2013 Last updated at 17:00 BST

The Islamist militants involved in the Kenyan siege rented a shop in the Westgate shopping complex where they were able to stockpile weapons and ammunition, senior security sources have told the BBC.

A BBC investigation into how the terrorists carried out the attack has also uncovered intelligence failures by the authorities.

Karen Allen reports from Nairobi.

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