BAGHDAD - A roadside bomb killed five U.S. Marines during combat operations in western Iraq, and the bodies of 21 Iraqis were found scattered in separate locations near a town close to the Syrian border considered an insurgent hotbed, officials and witnesses said Friday. The Marines were killed Thursday while conducting combat operations near the town of Haqlaniyah, 90 miles north of Baghdad, in volatile Anbar province, the military said in a statement