The Pentagon has confirmed the death of senior Isis commander Haji Imam in a daring daylight US-led raid in Syria. Imam was considered by many to be a potential successor to leader Abu Bakr al-Baghdadi. Imam's death comes just weeks after the killing of Tarkhan Tayumurazovich Batirashvil, also known as Omar al-Shishani or Omar the Chechen, and represent yet another setback for the Islamists in the areas of Syria and Iraq in which they aim to create a caliphate.