At least 26 explosions struck cities and towns across Iraq on Tuesday, killing at least 49 people and wounding more than 200, despite a massive security clampdown ahead of next week's Arab League summit in Baghdad. It was Iraq's bloodiest day in nearly a month, and the breadth of coordinated bombs in more than a dozen cities showed an apparent determination by insurgents to prove that the government cannot keep the country safe ahead of the summit. Iraq is due to host the meeting for the first...