Hundreds of Yazidi women and children who were taken hostage by the brutal regime were released this week after more than eight months in captivity.
But volunteers in huge make-shift refugee camps have given a distressing account of trauma and abuse at the hand of the jihadist group, which continues to wage a bloody war across the region.
Charity workers said one nine-year-old girl, who was left pregnant after being raped by at least 10 different men, was so young and weak she was likely to die during childbirth.
“Even a caesarean section is dangerous,” Yousif Daoud, a Canadian-based aid worker who recently returned from the region, said.
“The abuse she has suffered left her mentally and physically traumatised.”