Children caught in Raqqa fighting

Save The Children has called on all sides fighting the Islamic State group in the Syrian city of Raqqa to do all they can to allow civilians to leave safely. The charity says between 18,000 and 25,000 people are left in Raqqa, almost half of them children. Diana Magnay reports now on life in a city under siege as told by children filmed by the charity, who managed to escape.