At the suggestion of American psychological operations experts, B-29s spent August 13 dropping leaflets over Japan, describing the Japanese offer of surrender and the Allied response. The leaflets, some of which fell upon the Imperial Palace as the Emperor and his advisors met, had a profound effect on the Japanese decision-making process. It had become clear that a complete and total acceptance of Allied terms, even if it meant the dissolution of the Japanese government as it then existed, was the only possible way to secure peace. The Big Six and the cabinet debated their reply to the Allied response late into the night, but remained deadlocked. Meanwhile, the Allies grew doubtful, waiting for the Japanese to respond. The Japanese had been instructed that they could transmit an unqualified acceptance in the clear, but instead they sent out coded messages on matters unrelated to the surrender parlay. The Allies took this coded response as non-acceptance of the terms.