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RPT-CHIEF OF BRITAIN'S MILITARY RESEARCH CENTRE PORTON DOWN SAYS EXPERTS UNABLE TO IDENTIFY PRECISE SOURCE OF NOVICHOK NERVE AGENT THAT POISONED RUSSIAN DOUBLE-AGENT - SKY NEWS

RPT-CHIEF OF BRITAIN'S MILITARY RESEARCH CENTRE PORTON DOWN SAYS EXPERTS UNABLE TO IDENTIFY PRECISE SOURCE OF NOVICHOK NERVE AGENT THAT POISONED RUSSIAN DOUBLE-AGENT - SKY NEWS