article_snippet: Counter-terrorism officers revealed three girls, two aged 15 and one of 16, all from London, had flown to Turkey, a staging post for extremists wanting to cross the border to join IS.
article_snippet: The teenagers were linked by police to another 15-year-old girl who joined IS in December.
article_snippet: Last month, three schoolgirls, aged 15 and 16, flew out of UK to join jihadists in Syria.
article_snippet: Shamima Begum, 15, Kadiza Sultana, 16, and a 15-year-old German girl, who has not been named at the request of Nur family, were believed to have left to marry jihadi fighters.
article_snippet: It is understood the three girls –
article_snippet: Around 550 young Britons are thought to have made the journey to join Islamic State.
article_snippet: Around 550 young Britons are thought to have made the journey to join Islamic State including three schoolgirls, aged 15 and 16, who flew out of UK to join jihadists in Syria .