Truman cabled on 20 April that he did not see the communiqué he had signed as obligating the United States to assist Britain in designing, constructing and operating an atomic energy plant.[128] Attlee's response on 6 June 1946[129] "did not mince words nor conceal his displeasure behind the nuances of diplomatic language."[128] At issue was not just technical co-operation, which was fast disappearing, but the allocation of uranium ore. During the war this was of little concern, as Britain had not needed any ore, so all the production of the Congo mines and all the ore seized by the Alsos Mission had gone to the United States, but now it was also required by the British atomic project.