Warning: This report contains graphic images.
In this exclusive report, Mark Stone talks to inmates inside an IS prison in northeastern Syria.
Some of the prisoners are horribly disfigured and many are questioning what will happen to them.
Ishak Mostefaoui, a prisoner who originated from east London, admits he was with the Islamic State but says he no longer believes in its values.
But a prison guard describes the situation as a “ticking time bomb waiting to explode”.
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