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The longest prison riot in British penal history began at Strangeways Prison in Manchester, lasting 25 days.

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Strangeways Prison riot
25-day prison riot in Manchester, England
The 1990 Strangeways Prison riot was a 25-day prison riot and rooftop protest at Strangeways Prison in Manchester, England. The riot began on 1 April 1990 when prisoners took control of the prison chapel, and quickly spread throughout most of the prison. The incident ended on 25…Source: Wikipedia (CC BY-SA)
HM Prison Manchester
Prison in Manchester, England
HM Prison Manchester is a Category A and B men's prison in Manchester, England, operated by His Majesty's Prison Service. It is still commonly referred to as Strangeways, which was its former official name derived from the area in which it is located, until it was rebuilt…Source: Wikipedia (CC BY-SA)