One Islamic State militant is reportedly responsible for killing 150 women, including pregnant women and young teenagers, because they refused to comply with the "Jihad marriage" order enforced by the terrorist organization, according to Iraq's Ministry of Human Rights.

Abu Anas Al-Libi is suspected of gunning down the women, most of whom were Yazidi, because they refused to enter into sham temporary marriages simply for the purpose of performing sexual acts with the ISIS terrorists, a practice believed to be a Koranic loophole, Al Arabiya's Jawad El-Hatab reported on Tuesday.

"At least 150 females, including pregnant women, were executed in the Iraqi city of Al-Fallujah by a militant named Abu Anas Al-Libi after they refused to accept jihad marriage," said the Ministry.

"Many families were also forced to migrate from the province's northern town of Al-Wafa after hundreds of residents received death threats."

While the victims were buried in two mass graves in Al-Zaghareed and Al-Saqlawiya areas by the ISIS militants, the families who reportedly began to migrate ended up with dead children after being stranded in the desert, according to Iraqi officials.

After perpetrating the mass execution, the militants allegedly turned the Al-Hadra Al-Muhamadiya mosque in Fallujah into a big prison, holding hundreds of men and women captive, Breitbart reported.

In cities like Al-Fallujah and surrounding villages, forced relationships are regularly being pushed onto captives, according to Fox News.

Last Friday, the Islamic State distributed an eight-page pamphlet to mosques in the Iraqi city of Mosul and nearby towns on the topic of female captives and slaves, the Ministry said.

Titled "Questions & Answers on Taking Captives & Slaves," the pamphlet clarifies what the terror group believes permissible for its militants to do with their captives, including having sexual intercourse, taking women hostage, marrying more than one woman, beating and trading them, according to the Middle East Media Research Institute.

"This is a cheap 'Fatwa' that is far from what Islam really stands for and is in violation of human rights," the Iraqi ministry said. "It is a portrayal of these murderers' devilish-like behavior and low moral standing."