File photo shows Japanese bacteria troops in Yiwu, east China's Zhejiang Province, in June 1942. Invading Japanese troops set up 60 germ warfare units involved more than 10,000 troops from 1932 to 1945 in China and victimized at least 270,000 Chinese civilians. Japanese troops, including notorious Unit 731, developed and produced germ weapons based on bacteria experiments on human bodies and used germ weapons against Chinese civilians in battles and released plague, anthracnose and glanders on Chinese mountains, forests, rivers and fields. (Photo/Xinhua)
