The IPCC has questioned the decision of three police forces not to discipline three officers after an investigation into a meeting in the wake of the plebgate scandal.
The former Chief Whip, Andrew Mitchell, met the trio to discuss reports he'd called Downing Street guards "plebs".
He denied shouting the insult - but the police watchdog says the officers may have lied about what he told them.
ITV News Political Correspondent Carl Dinnen reports:
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.