Detectives investigating allegations of historical sexual and physical abuse on inmates at County Durham Young Offenders' Centre have begun interviewing former staff.
The alleged abuse took place between the 1960s and when the centre closed in 1988.
Since August last year, 915 former inmates have contacted police to report they were the victims of physical or sexual assaults.
The detective leading the investigation into alleged historical abuse at a now-defunct County Durham detention centre has told ITV News his team has gathered all the information needed to move to the "suspect stage".
Durham Constabulary's Det Supt Paul Goundry said his team had formally interviewed nearly all of the 915 former detainees that reported being victims of sexual or physical abuse and had built up a clear picture of how Medomsley Detention Centre operated for the 25 years it was open.
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