An e-mail to police chiefs from Deborah Glass, of the IPCC, said a police investigation into a meeting between police officers and Andrew Mitchell, initially concluded the Police Federation representatives had a case to answer for misconduct but later reversed its decision.
Bob Jones, PCC for West Midlands, one of the forces entangled in the affair, said her e-mail effectively suggests senior officers interfered with the report and has demanded an explanation from IPCC chairwoman Dame Anne Owers.
In a letter to Dame Anne, Mr Jones said he has received assurances from his chief constable that West Midlands Police only received one copy of the report, although it is West Mercia Police, a neighbouring force, that was responsible for the internal inquiry.
If I was to make an analogy with the criminal justice process, the press release is akin to a police officer commenting after a trial that the accused was, despite being acquitted, guilty as hell.
It's turning out to be a big week in the life of the story we call "plebgate".
West Mercia Police have confirmed they are reviewing a report on the 'Plebgate' scandal which is alleged to have been fundamentally altered.
Claims have emerged police officers changed the conclusions of a probe into a meeting between Andrew Mitchell and federation members.