Threatened with death for trying to leave
A source with extensive connections in Syrian jihad says at least 30 British ISIS fighters are trapped with the group, threatened with death if they try to leave. Former Guantanamo detainee Begg confirms the report:
When it becomes solidified as an Islamic State, a caliph, and you swear allegiance, thereafter if you do something disobedient you are now disobeying the caliph and could be subject to disciplinary measures which could include threats of death or death