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A new Islamic State guide for women has declared that girls can be married at nine and that fashion boutiques are the work of the devil.

The online document, which calls itself a “manifesto”, is the most comprehensive insight so far into the life that female jihadists can expect. It claims that women who follow Western ways of life by working have gained “nothing from the idea of equality” apart from “thorns” and that life should instead be based in the home.

It says that most “pure girls” will be married by 16 or 17 and remain hidden from view for the rest of their lives. But it also claims that the IS has “not forbidden a thing” and that girls can be educated alongside boys from the ages of seven to 15. It also insists that its base in the Syrian city of Raqaa is “a haven for migrants” and that life is normal for women living under its protection. The emergence of the new document, published initially in Arabic by the all-female Al-Khanssaa Brigade, follows its discovery and translation by the counter-radicalisation think tank Quilliam.

It came as a report by the Commons Defence Select Committee called for British military forces to play a greater role in taking on IS fighters in Iraq with more air strikes and the deployment of special forces. The new IS guide for women will, however, intensify the separate debate about how best to counter its extremist ideology and deter British women from travelling to Syria to join the fighters.

The main target of the document appears to be women living in other Arabic states, with a comparison of life in the IS “caliphate” and that experienced by women in the Arabian Peninsula. It claims that the latter face “barbarism and savagery” and are exposed to TV channels “of prostitution and corruption”. Haras Rafiq, the head of Quilliam, said the guide clarified what “jihadist brides” could expect.

A UN report today said that IS was systematically killing, torturing and raping children and families of minority groups in Iraq.