First in world news, a report on the latest attacks on Afghanistan, here is the CNN’s Jamie McIntyre: On day four, U.S. bombers shifted focus, moved from disabling air defenses to attacking troops, their barracks and military maintenance facilities. War planes from two U.S. aircraft carriers circled the skies, waiting to strike any movement of al-Qaida or Taliban forces. The idea, said Pentagon officials, is to keep bin Laden and his backers on the run.