UK Prime Minister Theresa May has told parliament that a military-grade nerve agent was used in an attack on former Russian double agent Sergei Skripal. The attack has left Skripal, 66, and his daughter Yulia, 33, in a critical but stable condition. A police officer who attended the victims also remains seriously ill. May says the substance used belongs to the Novichok group of nerve agents, but what are Nivochok agents and what do they do?..
Continue Reading Russian spy attack: What are Novichok nerve agents and what do they do?
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