The High Court has ruled that US intelligence documents containing details of the alleged torture of a former UK resident can be released.
Ethiopian-born Binyam Mohamed, 30, who spent four years in Guantanamo Bay, claims British authorities colluded in his torture while in Pakistan.
High Court judges were previously blocked from making the details public.
The Foreign Office denies allegations of collusion and says it will appeal against the court's judgement.
'Inviolable principle'
In a statement, Foreign Secretary David Miliband said the UK government was "deeply disappointed" at the ruling.
"The issues at stake are simple, but profound. They go to the heart of the efforts made to defend the security of the citizens of this country," he said.
"We only share British intelligence with other countries on the basis that they will not disclose that intelligence without our express permission. The same inviolable principle applies to foreign intelligence shared with us."
Mr Miliband said the government stood "firmly against torture and cruel, inhuman and degrading treatment or punishment", but he vowed to continue to challenge the court's ruling "in the strongest possible terms".
"I am determined that the vigour with which we fight this case will maintain the confidence of and send a clear message to all our intelligence partners across the world," he said.
"The United Kingdom will protect the information that you share with us and uphold the principle that it is for you, not us or our courts, to decide if and when to release such material in to the public domain."
The US also denies any allegations of torture concerning Mr Mohamed.
I was looking at myself talking to myself and I realized this conversation...I was having with myself looking at myself was a conversation with myself that I needed to have with myself.
David Milliband, if you had nothing to hide, you would not hide.
Does he really think there aren't any people who don't believe the UK uses torture? The harder you defend trying to conceal the evidence, the more obvious it becomes that you use it.
Yes it is obvious they must have used torture...I can't imagine the pain Binyam Mohamed must have went through.
I was looking at myself talking to myself and I realized this conversation...I was having with myself looking at myself was a conversation with myself that I needed to have with myself.
The government look more suspicious by hiding the facts! If they had nothing to hide why are they being so secretive!!
May The Almighty bring ease to all our brothers and sisters in Guantanamo bay and all the other prisons we know of and dont know of. May He instill immense tranquility within them and exchange their grief with peace. Insha'Allah the tables will turn soon.
WithHardship Indeed There is Ease [94:6]
Sponsor me www.justgiving.com/mahfuja-ahmed. Running 10K for Nour (Domestic Violence).
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