Deputy Assistant Commissioner Sue Akers on Monday told a judge-led inquiry into media ethics that her force was combing through a huge mountain of data to find evidence for the claims.
The phone hacking scandal erupted last year after it emerged that journalists at Rupert Murdoch's newspapers routinely eavesdropped on phones in order to win scoops.
The investigation has since grown to take in allegations of computer hacking, bribe-paying, and public corruption.
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