Experts unable to identify source of nerve agent but UK says it's Russia

Experts unable to identify source of nerve agent but UK says it's Russia  CNN UK Lab Says It Doesn't Know Nerve Agent's 'Precise Source,' Drawing Russian Retort  NPR British lab confirms Novichok was used in spy attack but can't determine source  Washington Post Porton Down experts unable to verify precise source of novichok  The GuardianFull coverage

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