(The Telegraph) – Fighters from the Islamic State have proudly posted photos of a child who they claim is the youngest person to die while fighting on their side. The 10-year-old boy is named by the Islamists as Abu Ubaidah. A Twitter account run by Isil sympathisers said on October 9 that he was killed, alongside his father, by an American air strike two weeks ago. US aircraft have been carrying out air strikes across Iraq and northern Syria, and the account did not say where he was killed. But the disturbing series of photos posted by the Isil account show a smiling boy wearing a woollen hat and combat fatigues, posing frequently with guns.