Giving evidence to the Leveson Inquiry into press standards, the Met's Deputy Assistant Commissioner Sue Akers alleged two prison officers at two separate high security prisons took payments from journalists.
The first official is accused of receiving payments from Trinity Mirror, News International and Express Newspapers between April 2010 and June 2011, totalling nearly £35,000.
Another prison officer at a different high security prison allegedly received payments from Trinity Mirror between February 2006 and January 2012, totalling more than £14,000, the inquiry heard.
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Speaking exclusively to ITV News, the man said he wanted to be able to return to the UK without the threat of prosecution.