IS schoolgirl Shamima Begum could be arrested and investigated if she returns to the UK, the Met Commissioner has said.
Cressida Dick said the 19-year-old could expect to be "spoken to" if she comes back to Britain.
The initial police stance when Shamima Begum left Bethnal Green in 2015 was that she may be treated as a victim of grooming, but the Scotland Yard chief said on Tuesday: "We're a long way down the road since then."
Ms Begum fled her east London home aged 15 to travel to Syria to support IS, but now wishes to return home for the sake of her third child, who was born at the weekend. Her two older children have died.