Officials in Iraq say a car bomb blast killed at least six people at a Baghdad cafe.
The officials say the blast was aimed at Iraqi police.
The explosion came hours after insurgents fired mortars at an arms collection site in Baghdad's Sadr City, killing two people. That attack came just ahead of interim Prime Minister Iyad Allawi's visit to the area.
Also Sunday, U.S. forces pounded insurgents in the Iraqi city of Fallujah as Iraqi officials again urged the city to expel foreign fighters believed to be holed up there.
Witnesses say at least three people were killed.
On Saturday, militants shot and killed nine Iraqi policemen as they were returning from training in Jordan.
Information for this report is provided by Reuters, AFP and AP.