A man mourns his loved ones killed in a rocket attack on the Khamaliya neighborhood in Baghdad, Iraq, Sunday, March 23, 2008, during their funeral. [Agencies]

Police also found the bullet-riddled bodies of 12 people – six in Baghdad, four in Mosul and two in Kut, scene of clashes between government troops and Shiite militiamen.

Elsewhere, several mortars or rockets struck a US base in the Shiite city of Hillah, about 60 miles south of Baghdad, Iraqi police said. The American military did not immediately respond to a request for comment about the attack.

No group claimed responsibility for the Green Zone attacks, but suspicion fell on Shiite extremists based on the areas from which the weapons were fired.