Two officers at high-security prisons allegedly took illegal payments from Mirror, Express and News International journalists, a senior police officer has told the Leveson Inquiry.
Metropolitan Police Deputy Assistant Commissioner Sue Akers said one officer had allegedly received £35,000.
But she said stories possibly linked to the payments revealed "very limited material of genuine public interest".
Trinity Mirror said it was co-operating with the police on the matter.
The fourth module of the inquiry, launched in the wake of the phone-hacking scandal, is focused on future press regulation.
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