Former prison staff are being interviewed as part of an investigation into more than 900 claims of alleged historical sexual and physical abuse on inmates at a young offenders' centre in County Durham.
Durham Constabulary said 915 men had contacted officers claiming they were abused at Medomsley Detention Centre since the investigation was established in August 2013.
The ex-detainees were all in their teens when they were sent, for often relatively minor offences, to Medomsley from the 1960s until the centre closed in 1988, where they spent around six to eight weeks before being released.
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