| The first use of chemical agents as weapons of mass destruction occurred during World War I (1914-1918). Chemical weapons were also used during the Iran-Iraq War (1980-1985). Chemical weapons were a concern during the Persian Gulf War (1990-1991), and more recently, were used by a terrorist group in Japan. A Russian soldier wears a gas mask, top left, during a chemical attack in World War I; a subway passenger in Tokyo, Japan, top right, is aided by two others after succumbing to nerve gas released in March 1995 by the religious sect Aum Shinrikyo; an explosion at an Iraqi ammunition bunker, bottom, after the Persian Gulf War, exposes United States troops to a chemical agent. |
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