Iraq is starting to unravel:
Sunni insurgents have cut the roads linking the city to the rest of Iraq. The country is being partitioned as militiamen fight bloody battles for control of towns and villages north and south of the capital.
As American and British political leaders argue over responsibility for the crisis in Iraq, the country has taken another lurch towards disintegration.
Well-armed Sunni tribes now largely surround Baghdad and are fighting Shia militias to complete the encirclement.