Mortar Barrage Kills 27 in Kufa Mosque KUFA, Iraq - A mortar barrage slammed into a mosque filled with Iraqis preparing to march on the embattled city of Najaf, killing 27 people and wounding 63 Thursday, while the nation's top Shiite cleric headed to the area in a massive convoy hoping to end three weeks of fighting.    Hours later, unidentified gunmen opened fire from an Iraqi National Guard base on thousands of Shiite Muslim marchers heading to Najaf, killing at least three and wounding 46, witnesses said...