From Computer Weekly,

“Kent Police are pursuing a number of leads following a burglary at Sevenoaks-based Forensic Telecommunications Services (FTS) in which a server containing data on suspicious telephone calls over the past two years was stolen.

A police spokeswoman said, “The computer equipment contained evidence relating to telephone use linked to around 250 cases from police forces and law enforcement agencies across the UK, covering the last two years.

She declined to say whether the data was encrypted.

…A spokesman for FTS declined to provide any details beyond a prepared statement.

However, a Mail on Sunday report said the cases were related to counter-terrorism investigations.”