BAGHDAD — Iraq's leaders faced their gravest challenge in months Tuesday as Shiite militiamen loyal to anti-American cleric Muqtada al-Sadr battled government forces for control of the southern oil capital, fought U.S. and Iraqi troops in Baghdad and unleashed rockets on the Green Zone.
Armed Mahdi Army militiamen appeared on some Baghdad streets for the first time in more than six months, as al-Sadr's followers announced a nationwide campaign of strikes and demonstrations to protest a government crackdown on their movement....
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