An aide to a powerful Shiite cleric in Iraq says extremists have agreed to a cease-fire in Sadr City.

The aides to Muqtada al-Sadr says the cease-fire will go into effect tomorrow. He spoke today in the southern city of Najaf.

The cease-fire would not necessarily end clashes in Sadr City, which is the stronghold of al-Sadr's Mahdi Army. The U.S. military has blamed clashes on groups who broke away from the main Mahdi militia.