US and Iraqi forces have killed at least 13 gunmen in battles overnight in Baghdad's Sadr City.
A military statement described a 'complex' battle in the eastern Baghdad district, a stronghold of fighters loyal to Shia cleric Moqtada al-Sadr.
It has been blockaded by US and Iraqi forces for the past two weeks.
US forces fired at least one Hellfire missile from drone aircraft and two rounds from the main battle gun of an M1 tank against fighters who targeted them with roadside bombs, rifles and rocket-propelled grenades.
Sadr City has been the scene of clashes all week. Locals described the overnight battles as the heaviest since government forces launched an offensive into the slum on 6 April.
