Volunteers in newly formed Peace Brigades march in a parade near the Imam Ali shrine in Najaf, Iraq, on Friday, after calls by the radical Shiite cleric Moqtada al-Sadr to form brigades to protect Shiite holy shrines against possible attacks by Sunni militants. One of the Shiite cleric’s cousins has been mentioned as a possible successor to Iraqi Prime Minister Nouri al-Maliki.

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