Nineteen Yazidi women who refused to have sex with their ISIS captors were reportedly placed in iron cages and burned alive in Mosul.

"The 19 girls were burned to death, while hundreds of people were watching," one unnamed witness tell ARA News.

"Nobody could do anything to save them from the brutal punishment."

Ynetnews.com reports the executions were conducted last weekend. 

According to ARA News, the ISIS jihadists captured the women as sex slaves after overtaking a northern Iraqi region in August 2014.

"They were punished for refusing to have sex with ISIS militants," local activist Abdullah al-Malla tells ARA News.

Human Rights Watch and the United Nations have called on ISIS to release the girls, citing human rights abuses, Fox News reports. 

"The longer they are held by ISIS, the more horrific life becomes for Yazidi women, bought and sold, brutally raped, their children torn from them," Skye Wheeler, a women’s rights emergencies researcher at Human Rights Watch, tells ARA News.

Officials of the Kurdistan Regional Government charge that ISIS fighters in Iraq and Syria continue to hold about 1,800 abducted Yezidi women and girls, ARA News reports.

Some of the women have even been put up for sale through social media sites like Facebook. 

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