The US state department yesterday warned that disclosure of secret information in the case of a British resident said to have been tortured before he was sent to Guantánamo Bay would cause "serious and lasting damage" to security relations between the countries.

Stephen Mathias, a legal adviser to the department, also claimed that the "national security of the UK" would be affected by disclosure of the details of the detention and interrogation of Binyam Mohamed, 30, who is accused of conspiring with al-Qaida.

Lawyers for the Ethiopian national have been arguing in the high court that they should have access to details of his interrogation from the time he was detained in 2002 until he was taken to Guantánamo Bay - where he is still held - in 2004. Mohamed claims that he was tortured by, among other methods, having his penis cut with a razor blade.

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