The sickest of protests: Syrian children as young as three are dressed in orange jumpsuits and locked in cage by activists in chilling stunt which echoes pilot's immolation by ISIS

Nearby, a man holds a burning torch like the one used to set fire to Lt Moaz al-Kasasbeh in a video released by the terror group earlier this month. Inside the cage, the children, some of whom appear to be as young as three, hold banners (inset) reading: 'Stop the killing of children'. The protest, held in Douma, near Damascus, aims to draw attention to Syrians living under siege and dying from air strikes by forces loyal to Syrian President Bashar al-Assad.