New footage appears to show three London schoolgirls in Turkey before what is believed to be their journey to Syria.
The footage, released by Turkish station ROJ TV and said to have been filmed by a spy accused of helping them cross the border, shows three girls leaving a taxi.
The station claims the girls are Shamima Begum, 15, Kadiza Sultana, 16, and Amira Abase, 15 - the three Bethnal Green Academy students that flew from Gatwick Airport to Turkey in February
The video was said to have been filmed by a foreign intelligence worker arrested this week on suspicion of helping the girls into Syria.
Other countries in the coalition include Saudi Arabia, Qatar, Jordan, Bahrain, Australia and Canada.
In the footage, the girls are told by a man with glasses, alleged to be the spy: "Take the Syrian passport".
He is shown at the end of the video in custody, though the details of the charges against him have not been made clear by Turkish officials.
The girls are thought to have since entered Syrian territory controlled by IS, with police and their families issuing appeals for their return.