A 46-year-old female police officer from Scotland Yard's Diplomatic Protection Group was arrested over alleged leaks to the media linked to the Andrew Mitchell "plebgate" affair, the Metropolitan Police said.
A 46-year-old male officer arrested yesterday has been bailed to return on a date in March.
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The rapper failed to make it to London in time as he had problems with his passport.
The Home Office was offered the help of specialist social workers in August but rejected it, it has been claimed.
Sunday will be largely dry with some bright spells of sunshine after any mist or fog lifts and clears.