The boss of the Metropolitan Police says MI6 staff may have samples of their DNA checked following the death of GCHQ officer Gareth Williams.
Bernard Hogan-Howe also demanded that MI6 give "unrestricted access" to detectives for the first time, as Scotland Yard reinvestigates the case. Mr Williams' body, was found locked in a bag, in a bath at his London flat in 2010.
A coroner concluded that he was 'probably unlawfully killed.'
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