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Articles on Tokyo sarin gas attack

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In this file photo taken on on Oct. 4, 1987, a Soviet army officer presents ammunition rigged with chemical agents during a visit by Western diplomats and journalists to a chemical weapons research facility in Shikhany, Saratov region, Russia. The facility in Shikhany led the efforts to develop Soviet chemical weapons, including Novichok-class nerve agents. John Thor Dahlburg/ AP Photo

What is Novichok? A neurotoxicologist explains

Novichok are a set of molecules that are some of the most deadly nerve agents ever developed. They are almost impossible to detect and clean up.

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