Fighting erupted early Monday in a Shi'ite militia stronghold of Baghdad, and a suicide bomber blew himself up among mourners at a funeral in Saddam Hussein's hometown, killing 10 people and injuring 22.
Three US soldiers were killed late Sunday in a roadside bombing southwest of Baghdad, the US military said. No further details were released.
In Baghdad, sounds of heavy gunfire and explosions rattled the Sadr City district starting about 1 a.m. Monday. Iraqi government television and aides to radical Shi'ite cleric Muqtada al-Sadr said US aircraft were attacking buildings in the area.
There was no immediate comment from the US military, which has reinforced its troop strength in the city to try to reclaim the streets from militias, including al-Sadr's Mahdi Army.