Police have recovered a server stolen from Sevenoaks-based Forensic Telecommunications Services.
The server contained information relating to forensic telephone evidence linked to some 250 police investigations over the past two years.
A police spokesman said the server was undamaged. "Examination revealed the information had not been accessed," the spokesman said. FTS declined to comment.
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FTS routinely provides evidence on fixed and mobile telephone use for police forces, the Crown Prosecution Service, and Customs and Revenue in connection with their investigations.