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9/11: Cheney was 'propelled out of office'

9 September 2011 Last updated at 15:59 BST

The former US Vice President Dick Cheney has reflected on the hours after the 9/11 terrorist attack.

He told how he was ushered out of his office by the Secret Service because of a potential security threat in the White House.

BBC News 9/11: Ten Years On