British lab confirms Novichok was used in spy attack but can't determine source

British lab confirms Novichok was used in spy attack but can't determine source  Washington Post UK Lab Says It Doesn't Know Nerve Agent's 'Precise Source,' Drawing Russian Retort  NPR British Lab Has Not Identified 'Precise Source' of Poison in Spy Case  New York Times Nerve agent attack: Johnson faces questions over Porton Down claim  Sky NewsFull coverage

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