WikiLeaks founder Julian Assange, who was arrested on Thursday at the Ecuadorian Embassy, is being held in one of the UK's most notorious prisons. Belmarsh, built in 1991 and located in southeast London, gained notoriety in the wake of the 9/11 attacks when foreigners were detained in the prison without being formally charged, leading some to call it 'Britain's Guantanamo Bay.' An unannounced inspection of the jail in early 2018 by the UK government showed progress in some areas, but regression in others. An action plan developed the prison in the wake of the inspection acknowledged areas where improvements could be made, but pushed back against some suggestions, including not keeping three men in cells meant for two.

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