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