At least a quarter of a million children are living under brutal siege in areas of Syria that have effectively been turned into open-air prisons. They and their families are cut off from the outside world, surrounded by warring groups that illegally use siege against civilians as a weapon of war, preventing food, medicine, fuel and other vital supplies from entering and stopping people from fleeing. Amid the spiralling atrocities in Syria, these children are among the most vulnerable of all. They want the world to hear their story.