The two Yemenis, Muhammad Bashmilah and Salah Nasser Salim 'Ali, were interviewed by A.I. in June. They told about their torture in Jordan.

Amnesty International believes the US has established secret detention facilities in a number of countries that could include Jordan, Pakistan, Egypt, Thailand and Afghanistan.

Ms Critoph says alleges the US has other secret detention centres the world does not know about. "Clearly, that's corroborated by other accounts," she said.

"The practice of secret detention, the fact that it is secret, makes it very, very difficult for Amnesty or other organisation to know how widespread it is, which is why we are calling on the US authorities to disclose exactly where these facilities are, exactly how many people and who are being held, and to also end this practice of secret detention," she said.