Officials: ISIL leader sexually assaulted American hostage

Kayla Mueller, an American aid worker who died in February while being held by the Islamic State, was repeatedly raped during captivity by Abu Bakr al-Baghdadi, the terror group's leader, according to counterterrorism officials and Mueller's family.

The accounts of Mueller's ordeal were first reported by British newspaper The Independent and later confirmed by her family to the Associated Press and ABC News.

Mueller, 26, from Prescott, Ariz., was taken captive in Syria in August 2013 while leaving a Spanish Doctors without Borders hospital in Aleppo.

Al-Baghdadi, the self-proclaimed "caliph" of the Islamic State, brought her "live and in person" to the home of Abu Sayyaf, a Tunisian in charge of oil and gas revenue for the group, counterterrorism officials have told ABC News over the past several months.

The details of Mueller's treatment were initially reported by several Yazidi girls who were held at the house, including a 14-year-old and her sister who managed to escape in August 2014, The Independent reported. The teen's version has been corroborated by U.S. officials.

The Yazidi teen eventually made her way to Iraqi Kurdistan, where she talked to U.S. commandos in November 2014, the Associated Press reported. Intelligence agenciescorroborated her account and American officials passed it on to Mueller's parents in June.

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