Government efforts to de-radicalise jailed Islamic extremists are failing, former inmates have told the BBC.

The prison service employs Muslim chaplains to "challenge and undermine extremist ideology".

But former prisoners claim the imams are viewed as "puppets" and allege some have even been assaulted.

The Ministry of Justice said it was working "with a number of third-sector partner organisations" to rehabilitate prisoners.

Around 200 extremists have been jailed since the 2005 London bombings and some are now due for release from prison and are returning to their communities.

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