London (CNN) -- Four top British police officers will not face further police investigation in connection with an inquiry into phone hacking by journalists, the Independent Police Complaints Commission said Wednesday. They are former Metropolitan Police Commissioner Paul Stephenson, former Assistant Commissioners John Yates and Andy Hayman and former Deputy Assistant Commissioner Peter Clarke. Stephenson resigned as head of London's Metropolitan Police, also known as Scotland Yard, after it was revealed that Scotland Yard had hired a former top News of the World journalist to be a communications consultant. The revelation came the same day police arrested the journalist, Neil Wallis, over the phone-hacking investigation.
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NEW: Yates says he will be exonerated over a separate investigation
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Paul Stephenson resigned as London's top police officer last month
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He says he expected this outcome and regrets police resources were used for the probe
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London's police have been accused of being too cozy with News International
Yates handed in his resignation the day after @placeholder quit.