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The twisted jihadist rantings of a young British mum have turned her into such a rising star among fanatics that she has become an “immense threat”.

Security services have now made finding London-born Khadijah Dare a “top priority” over fears that radical Muslims are answering her calls to leave the UK to join terror group the Islamic State on the front line in the Middle East.

But David Cameron is set to snub his own watchdog’s demands for tougher curbs on terror suspects when he unveils new laws to combat ­extremists.

Mum-of-one Dare, who last month vowed to become the first female Islamic State fanatic to behead a British or US hostage, has achieved celebrity status among jihadists .

The Mirror unearthed a video – now wildly circulating on extremist forums – showing burka-clad Dare, 22, firing an AK-47 rifle and pleading with fellow Brits to fight by her side in Syria.

Speaking in a London accent, she says: “These are your brothers and sisters as well and they need your help.

“So instead of sitting down and focusing on your families or focusing on your studies, you need to stop being selfish because time is ticking.”

Experts believe dozens of women have travelled from Britain to Syria to join the Islamic State during its murderous rampage across that country and Iraq.

A security source said: “The threat Dare poses is immense.

“Her notoriety has evolved so rapidly that she has achieved a celebrity like status among jihadists fighting in Syria and those who are thinking of travelling abroad to join IS.

“The threat from homegrown would-be terrorists such as her is very great. Dare has now become a top priority.”

The UK’s terror threat level was raised last week from “substantial” to “severe” in response to the carnage in Iraq and Syria. The new alert means the risk of an attack on Britain is classed as “highly likely”. It is the second highest of five possible threat levels.

MI6 is now on the hunt for Dare who left Britain in 2012 to enter an arranged marriage and live in Syria with her husband.

Experts believe the video, entitled Answering the Call – Foreign Fighters (Mujahedeen) in Syria, is a “dangerous recruiting tool” for the IS.

The four-minute film shows dozens of balaclava-clad fighters carrying black flags of jihad.

A voice dubbed over the images says: “Change, always in history, begins with youth.”

The footage of Dare, who is based in the town of Raqqa, was shot by an American Muslim living among Western jihadi fighters in Syria. He spoke with Dare this year as part of a documentary.

But his footage is now being used in scores of videos as a propaganda tool for the extremists.

The Mirror revealed last month how Dare, of Lewisham, South East London, made the sickening vow to behead a Westerner.

It came less than 24 hours after a video emerged of US journalist James Foley being decapitated by an IS thug, believed to be a Brit dubbed Jihadi John.

(Image: Reuters)

Among the British female jihadists who have joined the maniacs are at least 10 from London, two teenagers from Portsmouth, a Surrey woman and five from the north of England.

Two schoolgirl twin sisters Salma and Zahra Halane left their home in Chorlton, Greater Manchester, for “paradise” in the war torn Middle East.

The teens, dubbed the Terror Twins, have vowed never to return home.

A British woman who travelled to Syria to fight for IS has also revealed a desire to behead Christians.

It emerged yesterday that the woman – using the name Umm Hussain al-Britani or Sakinah Hussain – may be mum-of-two Sally Jones, a former rock singer in her 40s from Chatham, Kent.

Professor Anthony Glees, a terror expert and director of the University of Buckingham’s Centre for Security and Intelligence Studies, said: “This is not the first time women Islamists have taken part in terrorism.

"But what is worrying now is the blood-lust with which these female jihadists are pursuing their cause.

"If the IS leaders thought it wasn’t going to attract British women to jihad they wouldn’t be using women as recruiting sergeants.

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"They believe female jihadists have some kind of traction with an audience in Britain and this is of great concern.”

It is estimated that in total at least 500 Brits have joined the IS fanatics.

Mr Cameron is due to appear in the Commons today to announce measures to combat the terror threat.

His plans are expected to include confiscating passports from UK jihadists, and making airlines share passenger lists with security

services.

Resistance from the Lib Dems and concerns about human rights laws mean he is not expected to bring back powers to relocate suspects and put restrictions on who they speak to.

The powers were lost when the Coalition replaced control orders, a form of house arrest.

David Anderson, the independent reviewer of terror legislation, has called for the powers to be restored and Labour back his recommendation.

Defence Secretary Michael Fallon insisted that the terror threat was being taken very seriously.

But Shadow Home Secretary Yvette Cooper is urging ministers to admit their mistake and bring back “tried and tested” control orders.