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A British female jihadist has written a terrifying manifesto calling on young women to join Islamic State terrorists in Syria.

And in a chilling call for bloodshed on British streets she says: “If you cannot make it to the battlefield, then bring the battlefield to yourself.”

Privately-educated Aqsa Mahmood dropped out of university and left her comfortable middle-class life to marry an IS fighter in the war-torn state.

Now she is believed to be living among warlords and murderers in the IS stronghold of Raqqa.

Mahmood, 20, has penned an online diary inciting others to leave family behind by promising “once you arrive in the land of Jihad (it) is your family”.

She exhorts her army of followers to study violent jihadi texts before heading to Syria to “gain true honour by living under the law of Shariah”.

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Mahmood spouts her admiration for women who declare their “desires and cravings to participate in the battlefield and give away your blood”.

Friends have described her astonishing transformation from a “popular” teenager to a religious fanatic.

One said: “She got on with everybody, Asians and other girls as well. She was such a laugh to be around.”

Mahmood failed to achieve her desired grades at posh £3,500-a-term Craigholme School, in Pollokshields, Glasgow, but scraped into university to study diagnostic radiography.

Friends say she talked of moving to Syria to “help” in the fight against Bashar Assad’s regime.

Then one day in November last year, she left without warning.

She could be one of 50 British women who have joined IS in Syria, according to a security expert.

Olivier Guitta, consultant to the Home Office and Nato, said some had a passive role but a “worrying trend” was teenage girls “going to take a more active part in the fighting”.

Mr Guitta said female jihadists are being primed for attacks “in the homeland”.

It is understood Mahmood has been placed on an MI5 watchlist and could face terror charges if she tries to return to Britain.

Tonight, her parents released a statement through lawyer Aamer Anwer, who said: “The family are extremely distraught.

"Their daughter has ripped the heart out of the family.”