http://news.bbc.co.uk/1/hi/world/americas/7399644....
The American government has given no reason why charges against the man it has alleged was the "20th hijacker" in the 11 September 2001 attacks on the US have been dropped.
Mohammad al-Qahtani has been held at Guantanamo Bay since 2002, following his detention in Afghanistan.
However, proceedings against the five other suspects, including Khaled Sheikh Mohammed, appear to be going ahead.
It has been frequently reported, and is widely believed by civilian and military lawyers, that similar interrogation techniques were used in these cases, too.
So how are they able to go ahead, if the case against Mr Qahtani is dropped?
As well as his military lawyer, Mr Qahtani is represented by a civilian lawyer from the Center for Constitutional Rights - a New York-based legal rights organisation.
The CCR said in a statement it believed the charges against him had been dropped because Mr Qahtani had been tortured.
"The government's claims against our client were based on unreliable evidence obtained through torture at Guantanamo," it said.