'Secret prison used by CIA' says official

6 October 2010 Last updated at 18:19 ET Help

The CIA used a secret prison in Europe to torture its most important terrorism suspect, according to an official who first uncovered a secret network of prisons for holding suspects.

He told the BBC there was now reliable evidence that Khalid Sheikh Mohammed, the man accused of masterminding the 9/11 attacks, was tortured in Poland in the months before that country joined the European Union.

Daniel Sandford reports.

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