Violence erupted when security forces raided an anti-government protest camp in Hawija, near Kirkuk.
Two Sunni ministers said they were resigning in protest over Tuesday's raid.
It was the worst violence between security forces and Sunni protesters in recent months.
Tens of thousands of Iraqis in Sunni-dominated areas have been protesting against Prime Minister
Nouri al-Maliki... Prime Minister of Iraq and the secretary-general of the Islamic Dawa Party....
, accusing his government of discriminating against them.
The government denies the accusations and says that protesters have been infiltrated by turban groups.