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.
Members of the youth wing of the National Front, Malaysia’s ruling coalition, hold placards during a protest at the North Korea embassy following the murder of Kim Jong-nam in Kuala Lumpur. Athit Perawongmetha/Reuters

Malaysia says Kim Jong-nam was killed with a chemical weapon – here’s what you need to know

Using nerve agents is banned under the Chemical Weapons Convention, but North Korea is not a party to it.

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