The History of Plague as a Bioterrorism Agent

There's another story of plague as a bioterrorism agent in World War II. Apparently the Japanese army had been experimenting on Chinese prisoners by making plague bombs, intending to weaponize it and cause epidemics. There are also some reports from China that the American Air Force deployed some biological warfare agents in North Korea during the early 1950s. It's reported to have actually dropped infected fleas all over populated areas of China.