Shamima Begum and her two friends were smuggled into Syria by a Canadian double agent, reports claim. Ms Begum ran away from her home in east London aged 15 with Kadiza Sultana and Amira Abase to become a member of militant group Islamic State in 2015.
Four years later, she expressed her desire to return to the UK, but her British citizenship revoked by then Home Secretary Sajid Javid. He said the decision was made to "protect the British people".
However, Ms Begum denies any involvement in terrorist activities and is still fighting to return home. Her friend Ms Sultana was reportedly killed in a Russian air raid and Ms Abase is missing, Stoke-on-Trent Live reports.