"There were 1,250 attacks a week at the height of the violence; now sometimes there are less than 100 a week," he said.

The Shaab car bomb attack came three days after a suicide attack against Kurdish mourners in central Iraq, which killed 27 people and wounded 50 others.

On Monday, a bomb at a bus terminal in west Baghdad's Abu Ghraib district killed nine people and wounded 23, Iraqi police said.