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Mehdi Army fighters loyal to Shia cleric Moqtada al-Sadr march in Najaf, June 21, 2014 (Reuters/Alaa Al-Marjani)

Mehdi Army fighters loyal to Shia cleric Moqtada al-Sadr march in Najaf, June 21, 2014 (Reuters/Alaa Al-Marjani)