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Iraq #39;s top cleric arrives in Najaf on peace mission as a mortar &lt;b&gt;...&lt;/b&gt; By Abdul Hussein Al-Obeidi, Associated Press, 8/26/2004 08:16. NAJAF, Iraq (AP) Iraq #39;s top Shiite cleric made a dramatic return to Najaf at the head of a massive convoy Thursday hoping to end three weeks of  