Meanwhile: Iraqi rebels kill security chief
Iraqi rebels kill security chief
The commander of a new unit set up to fight insurgents in Iraq has been shot dead in Baghdad.
Iraqi officials say Wael Rubaie, head of operations at the Ministry for National Security, and his driver were killed on their way to work.
Also in Baghdad, US and Iraqi troops carrying out searches say they have arrested nearly 300 insurgents.
Elsewhere, car and suicide bombings killed at least 11 people and injured more than 100.
A recent surge in violence across Iraq is estimated to have killed more than 550 people in less than a month.
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