Iraqi police say a car bomb has killed at least five people and wounded 17 others in Baghdad, shattering a lull in insurgent attacks in the Iraqi capital.

Iraqi and U.S. forces launched a massive sweep for militants in Baghdad two weeks ago.

About 1,000 suspects have been arrested and the number of attacks has dropped. But a U.S. military commander says he cannot declare victory and warns that insurgents are looking for the chance to carry out large-scale attacks in Baghdad.

The U.S military says a roadside bomb killed five Marines Thursday in Iraq's western Anbar province.

Also in Anbar Friday, police found the bodies of 21 Iraqi men who were apparently executed. Some of them had been beheaded.

Authorities believe the victims were kidnapped Iraqi soldiers.

Some information for this report provided by AFP, AP and Reuters.