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In page American cover-up of Japanese war crimes:

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Japan's emperor Hirohito gave his consent regarding the policies and activities of Unit 731, Unit 100 and other human experimentation facilities.[citation needed] Though it is unclear on whether Emperor Hirohito was made aware of the full extent of Unit 731, the emperor's younger brother, Prince Mikasa, had toured the headquarters of Unit 731 and wrote in his memoirs that he watched films of how Chinese prisoners were "made to march on the plains of Manchuria for poison gas experiments on humans."[3]