A woman and a child were killed and four civilians injured Monday when mortar shells fell on central Baghdad's fortified Green Zone, police said.
Several mortar shells fell on an entrance leading to the Green Zone in Karadat Mariam, causing the fatalities, unnamed police sources told the Voices of Iraq news agency, dpa reported.
The Green Zone is an enclave on the west side of the Tigris River housing the US embassy and much of the Iraqi government.
Suspected Shiite fighters on Sunday pounded the Green Zone with a salvo of mortar shells in the fiercest attack on the area for weeks, benefiting from limited visibility that give cover to rocket- launching teams.
A sand storm has blanketed the Iraqi capital since Sunday. US aircraft, which normally prowls for launching teams, have been grounded by the storm.
Fighters from the Mahdi Army militia of Shiite cleric Moqtada al- Sadr have since end of March engaged in deadly clashes with US and Iraqi troops in the militia's stronghold in Sadr City in eastern Baghdad.
In the fiercest clashes in weeks, US and Iraqi troops killed 38 militiamen in the Shiite stronghold, including 22 who attacked a checkpoint, the US military said Monday.