Baghdad (AP) Iraqi authorities say at least 16 people have died during fighting in Baghdad's Sadr city.

Police said seven of the victims were killed when projectiles slammed into a house in the sprawling slum. It's a stronghold of the Mahdi army militia of Shiite cleric Muqtada Al-Sadr

Another attack involved mortar fire targeting a residential area.

The U.S. military also reports that a drone launched a missile overnight, killing two gunmen who'd been shooting at government forces.

The capital's U.S.-controlled green zone also came under rocket or mortar fire. The U.S. embassy says there are no reports of casualties.

The violence served as a stark reminder of Iraq's instability five years after U.S. troops swept into Baghdad.

The U.S. military also announced the deaths of two soldiers, one from non-combat-related injuries and the other in a roadside bombing.