File photo copied on Jan. 7, 2014 shows a "plague prevention" action in November of 1940 at Nongan County, northeast China's Jilin Province. The Japanese documents released on Friday by Jilin Provincial Archives regarding "biological warfare" show in detail Japanese troops' activities in building "bacteria forces" in its colonial regions and using human beings for experiments to develop biological weapons during World War II. According to the archives, Japanese "bacteria forces" including Unit 731 started biological warfare in more than 20 provinces and cities of China on 161 occasions, claiming more than 270,000 lives and causing more than 2.37 million people to be infected by plague. (Xinhua/Wang Haofei) |