Shamima Begum was a member of the Isis morality police, a feared group which enforced the terror organisation’s strict interpretation of Islamic law, according to reports.

The 19-year-old British citizen, who fled her home in Bethnal Green four years ago with two other schoolgirls, has claimed that she was only a “housewife” during her time living with the group in Syria.

But according to a report in The Sunday Telegraph she played a much more active role in the organisation’s reign of terror as a member of the “hisba” – which metes out punishment to those found flouting Isis laws on how to dress and behave.

One activist quoted by the newspaper said Begum had been seen holding an automatic weapon and shouting at Syrian women in the city of Raqqa for wearing brightly coloured shoes.

“Members of our group from Raqqa knew her well,” said Aghiad al-Kheder, an activist from Deir ez-Zor who founded an anti-Isis collective that published information about Isis crimes from sources on the ground.

Timeline of the Isis caliphate Show all 19 1 /19 Timeline of the Isis caliphate Timeline of the Isis caliphate ISIS began as a group by the merging of extremist organisations ISI and al-Nusra in 2013. Following clashes, Syrian rebels captured the ISIS headquarters in Aleppo in January 2014 (pictured) AFP/Getty Timeline of the Isis caliphate Abu Bakr Al-Baghdadi declared the creation of a caliphate in Mosul on 27 June 2014 Timeline of the Isis caliphate Isis conquered the Kurdish towns of Sinjar and Zumar in August 2014, forcing thousands of civilians to flee their homes. Pictured are a group of Yazidi Kurds who have fled Rex Timeline of the Isis caliphate On September 2 2014 Isis released a video depicting the beheading of US journalist Steven Sotloff. On September 13 they released another video showing the execution of British aid worker David Haines Timeline of the Isis caliphate The US launched its first airstrikes against Isis in Syria on 23 September 2014. Here Lt Gen William C Mayville Jnr speaks about the bombing campaign in the wake of the first strikes Getty Timeline of the Isis caliphate Isis militants sit atop a hill planted with their flag in the Syrian town of Kobani on 6 October 2014. They had been advancing on Kobani since mid-September and by now was in control of the city’s entrance and exit points AFP/Getty Timeline of the Isis caliphate Residents of the border village of Alizar keep guard day and night as they wait in fear of mortar fire from Isis who have occupied the nearby city of Kobani Getty Timeline of the Isis caliphate Smoke rises following a US airstrike on Kobani, 28 October 2014 AFP/Getty Timeline of the Isis caliphate YPG fighters raise a flag as they reclaim Kobani on 26 January 2015 VOA Timeline of the Isis caliphate Isis seized the ancient Syrian city of Palmyra on 20 May 2015. This image show the city from above days after its capture by Isis Getty Timeline of the Isis caliphate Kurdish forces are stationed on a hill above the town of Sinjar as smoke rises following US airstrikes on 12 November 2015 AFP/Getty Timeline of the Isis caliphate Kurdish forces enter Sinjar after seizing it from Isis control on 13 November 2015 AFP/Getty Timeline of the Isis caliphate Iraqi government forces make the victory sign as they retake the city of Fallujah from ISIS on 26 June 2016 Getty Timeline of the Isis caliphate Iraqi forces battle with Isis for the city of Mosul on 30 June 2017 AFP/Getty Timeline of the Isis caliphate Members of the Iraqi federal police raise flags in Mosul on 8 July 2017. On the following day, Iraqi prime minister Haider Al Abadi declares victory over Isis in Mosul Getty Timeline of the Isis caliphate Members of Syrian Democratic Forces celebrate in Al-Naim square after taking back the city of Raqqa from Isis. US-backed Syrian forces declare victory over Isis in Raqqa on 20 October 2017 after a four-month long campaign Getty Timeline of the Isis caliphate Female fighters of the Syrian Democratic Forces celebrate in Al-Naim Square after taking back the city of Raqqa from Isis. US-backed Syrian forces declare victory over Isis in Raqqa on 20 October 2017 after a four-month long campaign AFP/Getty Timeline of the Isis caliphate Trucks full of women and children arrive from the last Isis-held areas in Deir ez-Zor, Syria in January 2019 They were among the last civilians to be living in the ISIS caliphate, by this time reduced to just two small villages in Syria’s Deir ez-Zor Richard Hall/The Independent Timeline of the Isis caliphate Zikia Ibrahim, 28, with her two-year-old son and 8-month-old daughter, after fleeing the Isis caliphate, on Saturday 26 January 2019 Richard Hall/The Independent

“There were lots of young European women in the hisba. Some of them were very harsh and the local population became very scared.”

There were separate allegations that Begum stitched suicide bombers into explosive vests, so they could not be removed without detonating.

The Mail on Sunday reported that the prime minister and home secretary had been briefed on intelligence received by the CIA and Dutch military intelligence.

The allegations were made by other westerners who joined Isis, but have not been verified.

They emerged after a warning by the United Nations that “jihadi bride” stereotypes were causing female Isis recruits to be dangerously underestimated by global security services.

Men and women emerging from the terrorist group’s former territories have largely denied any wrongdoing or claimed coercion, and their true activities are hard to verify.

Begum has been stuck in a displacement camp for months after being detained while leaving Isis territory.

Isis fighter Yago Riedijk talks about meeting Shamima Begum

The teenager arrived heavily pregnant at al-Hol camp in February, and gave birth shortly after. But her newborn son, named Jarrah, died from a lung infection last month. It was her third child to have died during her time living in the caliphate.

The home secretary, Sajid Javid, stripped Begum of her citizenship and pledged to block British citizens suspected of joining Isis from returning to the UK where possible.

Ms Begum’s family lawyer, Tasnime Akunjee, visited al-Hol camp in March in an attempt to gain her signature for a legal challenge against the removal of her British nationality.

He claimed the move had made her effectively stateless and Bangladesh denied she was a dual national, but Mr Javid has denied breaking international law.

Mr Akunjee was not permitted to visit Begum by the Syrian Democratic Forces (SDF), who are guarding thousands of Isis fighters, female recruits and their children after driving the group out of its former territories.

The signature was needed for an appeal to the Special Immigration Appeals Commission, which has found previous government attempts to strip extremists’ British citizenship unlawful.

The family is proceeding with a separate judicial review of Mr Javid’s decision.

Mr Akunjee told The Independent that the death of Begum’s baby may form part of the case against the government.

Shamima Begum left the country with friends Kadiza Sultana and Amira Abase (Metropolitan Police)

“The death of the child goes to the proportionality of the original decision and whether that was a real risk, which we believe it was, and then it happened,” he added.

Mr Akunjee has not yet responded to the reports of Begum’s alleged activities in Syria.

The attention on her case has sparked a debate over how the UK should deal with British citizens who went to join Isis.

Begum and the two friends she travelled to Syria with had been interviewed by the police after a fourth friend from Bethnal Green Academy fled to join Isis months before.

Terri Nicholson, a former Metropolitan Police counterterrorism officer, said officers “spent tremendous effort on trying to stop people travelling to Syria in the first place”.