Shamima Begum, 15, Kadiza Sultana, 16, and 15-year-old Amira Abase went missing two weeks ago after boarding a flight from Gatwick to Istanbul.

The girls are believed to have crossed from Turkey to Syria through the town of Arai. Sky News reporter: ‘We are told by very good sources in Raqqa that they are there and that they are under the control of Islamic State.’

It also revealed that they were staying with a British girl – thought to be a pupil from their school who went missing in December and is believed to have joined ISIS.

The 15-year-old student, the first to disappear from Bethnal Green Academy in east London, has not been identified by the authorities.

At least 22 young women are feared to have travelled to Syria from the UK over the past 12 months. Scotland Yard has said the investigation into all the missing girls continues.

Sir Bernard yesterday warned that girls lured to Syria by ISIS faced sex abuse at the hands of ‘deeply misogynistic’ militants.

He said British jihadi brides were oblivious to the reality of life under the terror group and will be powerless to escape once they arrive.