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ISIS terrorists are picking out the “prettiest virgins” from the women they capture and sending them to their Syrian stronghold to be sex slaves, according to a UN expert.

And there are horrific reports about the fate of the brave women who resist the murderous terrorists - including one victim who was burned alive for refusing to perform “extreme sexual acts”.

Zainab Bangura, the special representative of the UN secretary general on sexual violence, has travelled to Syria, Iraq, Turkey, Lebanon, and Jordan and spoken to women who have endured sexual violence at the hands of militants, particularly women of the Yazidi minority.

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She spoke of how the terror group strips girls naked, conduct virginity tests, and send them to slave auctions after they have attacked their villages, often killing their husbands, fathers and brothers.

Fierce haggling usually breaks out at slave auctions, where the girls are sold naked.

ISIS leaders are the first to choose, followed by the fighters, Ms Bangura said.

Bidders often take three or four girls and then sell them on a few months later once they are bored of them, she told Middle East Eye.

"We heard of one girl who was traded 22 times and of a ISIS leader who had written his name on the girl’s hand to show that she was his “property”, the UN envoy said.

Some of the terrified women are so desperate to escape their ordeal that they use their headscarves to hang themselves.

As a result, the rapists of ISIS banned women from wearing headscarves in some areas.

(Image: Wikipedia)

Ms Bangura also spoke about a girl who had been burned alive after refusing to carry out the extreme sexual acts demanded by her sick “owner”.

Women are promised to fighters as a recruitment tool and the terror group raise funds through trafficking, prostitution and ransoms.

Sexual violence is also used to displace populations, to punish, humiliate and demoralise dissenters, to extract information for intelligence purposes and to dismantle communities, she added.