Four men including a serving police officer have been arrested over payments to police in the phone-hacking inquiry.
The 29-year-old male officer was detained at the police station in central London where he works.
The other three men, aged between 48 and 56, were arrested after police swooped on their homes, Scotland Yard said.
All four were held under Operation Elveden, which is running alongside the Operation Weeting hacking inquiry.
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