Former News of the World editor Rebekah Brooks was under surveillance at the height of the phone hacking scandal, it has been claimed.
Labour MP Tom Watson made the allegation in a new book on the crisis that engulfed Rupert Murdoch's empire.
It quoted one "well-placed News Corp source" as saying that cleaners were warned last June to avoid disturbing "listening devices" hidden in Mrs Brooks's office.
Security guards were also apparently instructed to record the times she entered and left the building.
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