Inside Story - 'Islamic caliphate': Blessing or threat?

An al-Qaeda breakaway group calls on Muslims throughout the world to swear allegiance. Sami Zeidan speaks to Khaled Al Maeena - editor-at-large at the Saudi Gazette; Bilal Abdul Kareem - a journalist and filmmaker who has filmed armed groups fighting in Syria; Douglas Ollivant - a senior national security Fellow with the New America Foundation, and former Iraq director on the National Security Council.