Torture victims who have been held in British immigration detention centres have launched a High Court challenge, claiming false imprisonment.
Many say they have been held in breach of the government's own guidelines.
Every year almost 30,000 people are detained in British Immigration Removal Centres.
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The majority are seeking asylum in the UK.
Many have fled civil war and persecution in their countries of origin, and some have experienced horrific torture.
British law states that if there is medical proof detainees have been tortured, they should be released immediately.
However, a report by the charity Medical Justice says this rule is routinely flouted.
