From Al Jazeera. Any opinions expressed are those of the authors, and do not necessarily reflect the views of Iraq Business News.
Several Sunni tribal sheiks and tribes in Anbar province have pledged allegiance to the Islamic State of Iraq and the Levant (IS, ISIS, ISIL).
They met in the city of Fallujah on Wednesday, and pledged support to the head of ISIL - Abu Bakr Al-Baghdadi.
Al Jazeera's Imran Khan reports live from Baghdad: