Jolie urged a "very strong response" to the crisis. ISIS, also known as Islamic State, has sold women as slaves during sick auctions in territories the group has captured, survivors have told NBC News.
Thousands of women and girls have been abducted, raped and sold into sexual slavery by ISIS since the militant group declared a caliphate across swathes of Syria and Iraq last summer, according to the United Nations and rights groups.
Oscar-winning Jolie, who joined forces with former British foreign secretary William Hague in 2012 to launch an initiative to prevent sexual violence in conflict, spoke about girls she had met in war zones who had been raped.
This included a 13-year-old Iraqi girl whom she said was raped repeatedly along with her friends and sold for $40.
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