The killers started early. Just after sunrise, they tracked the imam to his modest brick mosque, where he was praying on a green carpet. Three masked gunmen muscled past a handful of worshippers and pumped four bullets into the chest of Sheik Adbul Rahman Jawhar al-Karbouli. His murder Feb. 16 in a village near the Syrian border was barely noticed in Iraq’s daily body count. But _ like a vivid footnote in a dry collection of statistics _ it helps bring the violence among Iraqi into sharper focus. Full Story