3 December 1941. From: OPNAV. Action: CINCAF, CINCPAC, COM 14, COM 16. Info: 031850.
Highly reliable information has been received that categoric and urgent instructions were sent yesterday to Japanese diplomatic, and consular posts at Hongkong X Singapore X Batavia X Manila X Washington and London to destroy most of their codes and ciphers at once and to burn all other important confidential and secret documents X.