“There are two ways to prove your allegiance to Isis: either by getting married or by carrying out the punishments… They were merciless — the foreign fighters and the Syrians treated us the worst because they are the lowest in Isis [IS],” the former prisoner was quoted as saying by The Times.
European fighters who join ISIL find themselves isolated, and must prove their loyalty to the group.
With harsh living conditions some Europeans try to escape the caliphate, but this proves challenging due to numerous checkpoints. Those who refuse to fight are instantly killed, the former ISIL captive revealed.
The Islamic State is said to have recruited thousands of westerners. Official UK figures show that at least 500 Britons have joined the group so far, but the real number may be four times higher, the Times said.
Overall, at least 20,000 foreign fighters have joined ISIL so far, the US National Counterterrorism Center estimates.