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There as many as half a million Syrian refugee children who are not attending school, leaving them open to exploitation in sweatshops and other forms of abuse. Aid workers call them the "lost generation" and warn that unless they return to the classroom, Syria will lack educated people to help rebuild the country when the war eventually ends.

Tim Whewell meets children as young as nine employed up to 14 hours a day in textile sweatshops - and also a Syrian teacher who has helped rescue some of them from sweatshops by opening a special school for refugee children in Istanbul. Increasing educational opportunities for Syrians in Turkey may persuade some of them to give up their ambition of migrating to Europe but huge investment will be needed.

(Photo: Shaza Barakat and pupils)