A Canadian intelligence agent smuggled London teenager Shamima Begum and her two friends into Syria, according to reports.
Ms Begum fled her east London home for Syria as a 15-year-old schoolgirl with Kadiza Sultana and Amira Abase to join the so-called Islamic State group (IS) more than seven years ago.
She has denied any involvement in terror activities and is challenging a British government decision to remove her citizenship, while Ms Sultana was reportedly killed in a Russian air raid and Ms Abase is missing.
According to the BBC and The Times, Mohammed Al Rasheed, who is alleged to have been a double agent working for the Canadians, met the girls in Turkey before taking them to Syria in February 2015.
Both news organisations reported that Rasheed was providing information to Canadian intelligence while smuggling people to IS.
A spokesman for the UK government said: “It is our longstanding policy that we do not comment on operational intelligence or security matters.”
In a forthcoming podcast for the BBC, called I’m Not A Monster, Ms Begum is quoted as saying: “He (Rasheed) organised the entire trip from Turkey to Syria… I don’t think anyone would have been able to make it to Syria without the help of smugglers.
“He had helped a lot of people come in… We were just doing everything he was telling us to do because he knew everything, we didn’t know anything.”
In February 2019, Ms Begum was found, nine months pregnant, in a Syrian refugee camp. Her British citizenship was revoked on national security grounds shortly afterwards.
She decided to challenge the UK Home Office’s decision to remove her British citizenship and wanted to be allowed to return to the UK to pursue her appeal.
In July 2020, the UK Court of Appeal ruled that “the only way in which she can have a fair and effective appeal is to be permitted to come into the United Kingdom to pursue her appeal”.
The Home Office challenged the decision at the UK Supreme Court four months later. The Supreme Court ruled in February 2021 that Ms Begum should not be granted leave to enter the UK to pursue her appeal.
Last summer, during an interview, Ms Begum said she wanted to be brought back to the UK to face charges and added in a direct appeal to the British prime minister that she could be “an asset” in the fight against terror.
She added that she had been “groomed” to flee to Syria as a “dumb” and impressionable child.
Begum said she married Dutch convert Yago Riedijk 10 days after arriving in IS territory.
She previously told The Times that she left Raqqa in January 2017 with her husband but her children, a one-year-old girl and a three-month-old boy, had both died.
Her third child died in the al-Roj camp in March 2019, shortly after he was born.