text: Mortar Attack Kills 25 at Kufa Mosque NAJAF, Iraq - Iraq's top Shiite cleric unexpectedly returned to Iraq from Britain on Wednesday armed with a new peace initiative and a call for Iraqis across the country to march on the holy city to demand an end to weeks of fighting in Najaf.    But a mortar attack on the main mosque in the nearby city of Kufa killed 25 people and wounded 60 others Thursday, hospital officials and witnesses said, a blow to hopes that the crisis could be resolved peacefully...