Iraq Says Offensive Vs. Cleric to Start NAJAF, Iraq - An Iraqi Cabinet minister said Thursday that Iraqi forces could begin an offensive against Muqtada al-Sadr within hours, despite the firebrand cleric's acceptance of a peace proposal.    To prevent an imminent attack on his forces, who are holed up in the revered Imam Ali Shrine in Najaf, al-Sadr must immediately disarm his Mahdi Army militia and hand over its weapons to the authorities, Minister of State Qassim Dawoud said...