Afghanistan KABUL, Feb 13 , SPA -- A roadside bomb struck a vehiclecarrying Afghan security guards working for the U.S. military in eastern Afghanistan, killing four of them andwounding one, AP quoted an official as saying Wednesday. The blast targeted the guards' vehicle on Tuesday in theShinkay district of Khost province, said Wazir Pacha, aspokesman for the provincial police chief. Four security guards were killed in the explosion and onewas wounded, Pacha said. --SPA www.spa.gov.sa/526627