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

A British lab confirms Novichok was used in the spy attack — but can't determine the source  Pittsburgh Post-Gazette Putin demands Russia be included in probe of Russian ex-spy's poisoning  CBS News UK Lab Says It Doesn't Know Nerve Agent's 'Precise Source,' Drawing Russian Retort  WRVO Public Media Russia wants answers after UK fails to verify if poison was actually from there  Metro Chemical weapons watchdog meets to discuss Russian spy poisoning  The GuardianFull coverage

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