Hundreds of Yazidi women being held prisoner by Islamic State fighters in Iraq are being sold off as brides for as little as $25 or repeatedly raped if they refuse, it has been claimed.

Survivors have told how beauticians were brought in to put makeup on the women before they were attacked, and said some victims were forced to call their families after to explain what had happened.

According to those who escaped Badush Prison, in Mosul, northern Iraq, the number of women held there could be in the thousands and include Christians and Turkomens – a largely Muslim group closely related to the Turks.