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POPS13 Doctors Demand Inquest Into Dr David Kelly's Death Mr Halpin said that he lost more than 6,000 pieces of correspondence - many relating to Dr Kelly - during his investigation, explaining that the mystery began when the 'firewall' on his computer, which all similar machines are fitted with as a security measure, became inactive without warning. His emails started disappearing as though they were being sifted remotely. 'I believe this will have been done by a state-sponsored agency and not by an amateur acting singly,' he said. Dr Kelly's death may have been linked to the secret world of germ warfare research. Until his death Dr Kelly was privy to some of the state's most sensitive information and worked closely with the intelligence services of all the major industrialised countries.