Some of the most dangerous and radicalised convicted extremists in the prison system have been moved out into the first of three special "jihadi jail" separation units across England and Wales.

The first specialist centre is at HMP Frankland near Durham. Two other centres, which are expected to be at HMP Full Sutton near York and at HMP Long Lartin in Worcestershire, are due to open in the coming months and the three centres together will hold up to 28 of the most subversive extremist prisoners in the system.

The government's plans to isolate Islamist extremist prisoners from the mainstream high security jail population were first disclosed by the Guardian in February last year.

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