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The substance was sent to the Defence Science and Technology Laboratory at Porton Down to be examined by an expert in chemical and biological warfare agents.

Tests at Porton Down, the government's biological warfare laboratory, confirmed the substance was ricin, a poison for which there is no antidote.

Tests at Porton Down, the government's biological warfare laboratory, confirmed the substance was ricin, a poison for which there is no cure.

China’s biological warfare work is conducted within civilian research institutes, frustrating efforts by intelligence agencies to gather detailed information on the threat.

Seiichi Morimura, who wrote a searing exposé of the Japanese Army’s secret biological warfare program in occupied China, describing how it forcibly infected thousands of prisoners with deadly pathogens, died on July 24 in Tokyo.