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ISIS fighters are ordering terrified families in Iraq to hand over their daughters for sex.

Leaflets in the captured cities of Mosul and Tikrit claim the women – virgins or not – must join jihad, or Holy war, and cleanse themselves by sleeping with militants.

Those that refuse to do so are violating God’s will, it is claimed, and will be beaten or killed.

ISIS fighters have been taking women captive in Syria since last year when a Saudi-based cleric issued a fatwa – religious order telling them to. Now the sick practise is happening to Iraq.

Nasser Kataw, a lecturer at Baghdad University, said: “This is against all the teachings of Islam. They think the rape of women in this way is some kind of sexual jihad. It is not. It is a war crime.”

ISIS fighters yesterday seized key towns near Baghdad as it was revealed the Iraqi air force had run out of Hellfire missiles. Special forces were fighting back with the help of volunteers but ISIS took control of three out of four border crossings to Syria this weekend.

US President Barack Obama has offered to send military advisers but not air strikes. Tory minister Iain Duncan Smith said Britain would “support the Americans”.

Iranian Ayatollah Ali Khamenei opposed US action claiming they would put “yes men” in power.