NATO-led forces in Afghanistan are picking up the pieces after a deadly car bomb kills two U.S. contractors.<br/> <br />Officials said the two contractors were working for the international security force.<br/> <br />A local shopkeeper witnessed the attack. He thought three Americans were killed.<br/> <br />(SOUNDBITE) (DARI) EYEWITNESS AND SHOPKEEPER ZAHIDULLAH SAYING:<br/> <br />"The foreign convoy was passing the area when a suicide bomber in a Corolla blew up his vehicle targeting the convoy. He killed three Americans."<br/> <br />At least two Afghan civilians were injured in the attack.<br/> <br />Both were taken to a local hospital.<br/> <br />(SOUNDBITE) (Pashto) HOSPITAL DOCTOR SULTAN AHMAD SAYING:<br/> <br />"As a result of the blast we received two wounded, including a woman and a child. The child's condition was good so we discharged the child from the hospital, but the woman is still receiving treatment from the doctors."<br/> <br />Nobody has claimed responsibility for the attack.<br/> <br />The attack comes as the countr
