Meanwhile, the US has reportedly decided not to launch a major assault on Iraqi fighters in the troubled city of Falluja.
Instead it's decided to start patrols with Iraqi security forces.
US Marines launched operations in the city on 5 April after four US citizens were murdered there in March.
There were more deaths over the weekend when oil terminals near the southern city of Basra were targeted.
Three boats exploded in what appeared to be suicide attacks , killing and injuring several US soldiers.