BBC: Abu Bakr al-Baghdadi, the leader of Islamist militant group Isis, has called on Muslims to obey him, in his first video sermon. Baghdadi has been appointed caliph by the jihadist group, which has seized large swathes of Iraq and Syria. The video appears to have been filmed on Friday during a sermon at the al-Nouri Mosque in Mosul, northern Iraq.

It surfaced on Saturday amid reports that he had been killed or wounded in an Iraqi air raid. It was not clear when the attack was supposed to have taken place. In the sermon, at Mosul's most famous landmark, Baghdadi praised the establishment of the "Islamic state", which was declared by Isis last Sunday.

Experts say the reclusive militant leader has never appeared on video before, although there are photographs of him.