NEW : Two were U.S. military personnel , and the third was Afghan , a source said . ISAF says two of its members were killed . 13 Afghan civilians are among the dead . US Embassy sounds ` ` duck - and - run '' alarm as building fills with smoke .
NEW : 2 were U.S. military personnel , and the third was Polish , a source says . ISAF says 3 of its members were killed . 13 Afghan civilians are among the wounded . U.S. Embassy sounds `` duck-and-cover '' alarm as sky fills with smoke .