Insurgents stormed an Iraqi army checkpoint as dawn broke north of Baghdad on Monday, killing 12 people, including nine soldiers. Al Qaeda’s Iraq wing claimed the attack in a Web posting. Following in a pattern of closely coordinated attacks with rockets, infantry maneuvers and a suicide truck bomb, it was a reminder of the military potential of the Sunni Arab insurgency as the United States prepares to hand much of Iraq’s security over to the new Shi’ite-led government’s fledgling armed forces. Full Story