More than 150 women, including pregnant and underage girls, were murdered by Islamic State militants and buried in a mass grave in the Western province of Al-Anbar.This are the women who disagreed to marry fighters as part of becoming sex slaves.
Iraqi Ministry of Human Rights said that Islamic State Leader Abu Anas Al-Libi executed the women before burying their bodies in mass graves in Fallujah in the Iraqi province of Al Anbar. The process of killing was never mentioned in some reports. Many families also received threats of murder that forced them to migrate from Al-Wafa.
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ISIS is in control of a large part of Iraq and several parts of Syria. They were the suspect for the last month’s massacre against the tribe named Al Bu Nimr where 50 people were shot dead including women and children.

Recently, they issued a horrifying book guide on how to rape and enslave women. The guide book titled “Questions And Answers On Taking Captives And Slaves” which teaches the militants the how’s of buying and selling women that they captive during war.

Some of the question and answers in the said guide are translated by the Middle East Media Research Institute (MEMRI) and parts of it can be found abhorrent:

“Question 4: Is it permissible to have intercourse with a female captive?
“It is permissible to have sexual intercourse with the female captive. Allah the almighty said: ‘[Successful are the believers] who guard their chastity, except from their wives or (the captives and slaves) that their right hands possess, for then they are free from blame [Koran 23:5-6]‘…”

“Question 5: Is it permissible to have intercourse with a female captive immediately after taking possession [of her]?
“If she is a virgin, he [her master] can have intercourse with her immediately after taking possession of her. However, is she isn’t, her uterus must be purified [first]…”

“Question 6: Is it permissible to sell a female captive?
“It is permissible to buy, sell, or give as a gift female captives and slaves, for they are merely property, which can be disposed of [as long as that doesn’t cause [the Muslim ummah] any harm or damage.” […]

“Question 13: Is it permissible to have intercourse with a female slave who has not reached puberty?

“It is permissible to have intercourse with the female slave who hasn’t reached puberty if she is fit for intercourse; however if she is not fit for intercourse, then it is enough to enjoy her without intercourse.”

The pamphlet also stated that they have the rights to captive unbelieving women including Christians and Jews. On the other hand, it forbids the enslavement of Muslim women, even if they have become apostates.
References:
independent.co.uk   dailymail   theblaze