Campaigners are preparing to launch a demonstration outside Parliament on Monday to demand the release of Guantanmo detainee Shaker Aamer and an end to the "torture Olympics."
British resident Shaker Aamer has been held in Guantanamo for over 10 years without charge, much of that time in solitary confinement.
Concerns are growing for his physical and mental health amid claims he has regularly suffered torture and almost daily beatings at the US gulag.
In declassified documents released by Mr Aamer's lawyers, he has stated that he continues to suffer from beatings, being placed in stress positions, being subjected to temperature extremes, sleep deprivation, solitary confinement, forced feeding and daily forced extraction from cell to cell, and forced nudity.
A spokeswoman for the Save Shaker Aamer Campaign which, along with legal action charity Reprieve, has fought tirelessly for his release, told the Star: "The whole world, apart from a few dictators, has been welcomed to London for the Olympics and the Paralympics.
"Shaker Aamer, whose home is in London, has remained in his steel cell in solitary confinement in Guantanamo, despite facing no charge or trial.
"The London Paralympics will end September 9.
"We want the world to know that the Guantanamo Torture Olympics never ends for Shaker Aamer and for those who remain in Guantanamo in indefinite detention."
The demonstration is scheduled to take place on Monday September 10, from 1-3pm in Parliament Square.