The incidence of Tokyo subway attack by the Aum Shinrikyo cult in 1995 had raised the concern of the use of nerve agent as a weapon in terrorist attack. The recent event in World Trade Centre in New York city had further brought our attention to the possibility of terrorist attacks using these agents. In view of the high possibility of nerve agents being used as chemical weapon, medical personnel should have a clear knowledge of these agents. This article aim to provide a detailed discussion of these agents.
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