Members of Peace Brigades, a Shiite militia group loyal to Shiite cleric Muqtada al-Sadr, heading to Tikrit, where Iraqi troops backed by Shiite fighters and Iranian advisers are fighting extremists, sit with their weapons in an armored vehicle as they leave Baghdad, Iraq, Sunday, March 15, 2015. Dozens of fighters with the militia loyal to the radical Shiite cleric left Iraq's capital Sunday to take part in an offensive to capture Tikrit from the Islamic State group. (AP Photo/Karim Kadim)
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