 South Korean investigators disagreed with the U.S. report , saying that they believed that 7th Cavalry troops were ordered to fire on the refugees . The survivors ' group called the U.S. report a " whitewash " . The AP later discovered additional archival documents , showing that U.S. commanders had ordered troops to " shoot " and " fire on " civilians at the war front during this period ; these declassified documents had been found , but had not been disclosed by the Pentagon investigators . American historian <unk> Conway @-@ Lanz reported that among the undisclosed documents was a letter from the U.S. ambassador in South Korea , stating that the U.S. military had adopted a theater @-@ wide policy of firing on approaching refugee groups . Despite demands , the U.S. investigation was not reopened . 
