Search: Binyam Mohamed ruling
The White House said it was "deeply disappointed" at a UK Appeal Court ruling that revealed intelligence relating to torture allegations in the case of a former Guantanamo detainee.
On Wednesday Foreign Secretary David Miliband lost a bid to block public disclosure of information that revealed the "cruel, inhuman and degrading" treatment of Binyam Mohamed.
The White House said the ruling would make intelligence sharing with Britain more difficult in the future.
Binyam Mohamed, 31, an Ethiopian granted refugee status in Britain in 1994, claimed he was tortured while being held on suspicion of involvement in terrorism.
Now intelligence information relating to the allegations was released after three of the UK's highest-ranking judges dismissed Mr Miliband's appeal.
He had hoped to overturn an earlier court ruling that said summaries of information received by the British security services from United States intelligence should be disclosed.
The Court of Appeal decision was hailed by international media as a "resounding victory for freedom of speech".
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But White House spokesman Ben LaBolt said the US was "deeply disappointed" with the judgment. He said: "We shared this information in confidence and with certain expectations. As we warned, the court's judgment will complicate the confidentiality of our intelligence-sharing relationship with the UK, and it will have to factor into our decision-making going forward."
In Washington, a statement by the Office of the Director of National Intelligence, Dennis Blair, said the ruling was "not helpful". It said: "The protection of confidential information is essential to strong, effective security and intelligence cooperation among allies. The decision by a United Kingdom court to release classified information provided by the US is not helpful, and we deeply regret it."
The ruling by the Lord Chief Justice Lord Judge, the Master of the Rolls Lord Neuberger and the President of the Queen's Bench Division Sir Anthony May related to publication of seven paragraphs which had to be redacted from High Court judgments already handed down. One of the key paragraphs - released after the decision was announced - said that the reported treatment by the "United States authorities" of Mr Mohamed "could readily be contended to be at the very least cruel, inhuman and degrading".
