According to a new report Kayla Mueller, the American aid work who was kidnapped and subsequently murdered by ISIS, was repeatedly sexually assaulted by ISIS leader Abu Bakr Al-Baghdadi. Mueller’s parents told ABC news, “Kayla was tortured, that she was the property of al-Baghdadi. We were told that in June by the government.”

Al-Baghdadi is the leader and self-proclaimed “caliph” of the Islamic State and, according to ABC, he personally arranged to keep Mueller in the home of Abu Sayyaf, a high-ranking ISIS official who oversaw the illegal oil trade. Sayyaf was killed in a May raid on his compound and his wife was apprehended.

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Sayyaf’s compound was a sort of “safe house” for al-Baghdadi, he would visit the home to meet with Sayyaf. During those visits, he repeatedly raped Mueller.

ABC reports that in addition to Mueller, that the U.S. military discovered numerous Yazidi girls who were also enslaved at the compound. The girls provided the U.S. with a “wealth of information” that was used to piece together Mueller’s last years.

The Yazidi girls, as well as information obtained from Sayyaf’s wife, put to rest conspiratorial rumors that Mueller was a willing “bride” of an ISIS fighter—rumors that had obviously upset Mueller’s family.

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The news about Mueller comes on the heels of a long report by the New York Times which documented the systematic rape and abuse of girls by the terrorist organization. That abuse, underpinned by al-Baghdadi’s own “theology,” justifies the rape of non-Muslim women in the name of religious doctrine.

Kayla Mueller would have turned 27 on Friday.

Image via CBS.