Scotland Yard has warned of a growing trend of young women travelling to Syria after launching an urgent appeal to find three teenage schoolgirls inspired by a classmate to flee the country to join Islamic State (Isis).
The girls, all described as straight-A students from Bethnal Green Academy in East London, left home on Wednesday and flew to Turkey, raising fresh questions about the co-operation of airlines in attempting to prevent radicalised young Britons from travelling abroad.
Police believe that heavy snow in Istanbul is likely to have delayed the girls' plans to travel from Istanbul to the Syrian border and may provide a final opportunity to rescue them before they become effective prisoners of radicals in Syria.
Detectives are understood to be investigating whether the girls - Shamima Begum, 15, Kadiza Sultana, 16, and an unnamed girl, 15 - are part of wider group of teenagers from the highly rated school with ambitions to travel to the country.