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CIA 'tortured suspects' in secret prison in Poland
The CIA used a secret prison in Poland to detain and torture its key 9/11 suspect, it has been alleged.
Khalid Sheikh Mohammed, the attacks' alleged mastermind, was allegedly flown into the country and "waterboarded".
The allegation comes from a former human rights official amid an investigation into the country's role in secret CIA rendition flights.
The CIA told the BBC it would not discuss which detention facilities it may have used in the past.
But Dick Marty, the former Council of Europe Rapporteur on Torture, said there was now a "criminal standard of proof" to support long-held suspicions that the CIA had used Poland in a global network of detention sites for the most important al-Qaeda suspects.
Mr Marty told the BBC: "If I use the judicial standard of proof, and I used to be a magistrate, then I say, yes, Mohammed was in Poland. Yes, he was tortured."