Three police officers accused of deceiving MPs over the so-called Plebgate scandal are to face a new investigation by the police watchdog.
The officers - police federation representatives - will also be called back before an influential committee of MPs over evidence they gave to them previously.
The Independent Police Complaints Commission said there were "procedural irregularities" in an earlier probe.
Inspector Ken MacKaill, Detective Sergeant Stuart Hinton and Sergeant Chris Jones are accused of giving misleading accounts of a meeting with former chief whip Andrew Mitchell.
The Conservative MP met with the officers last October in a bid to clear the air after an alleged foul-mouthed confrontation with police in Downing Street the previous month.
The trio were initially told they would face no action for misconduct over misleading press statements they made immediately after the meeting.
But the Independent Police Complaints Commission (IPCC) has now said it will hold an investigation into their behaviour.
IPCC deputy chairwoman Deborah Glass said the watchdog was holding its inquiry to avoid damaging public confidence.
She said: "Evidence given to the Home Affairs Select Committee on October 23 revealed a number of procedural irregularities between the production of the draft and final West Mercia reports."
The officers have also been recalled to the Home Affairs Select Committee to apologise for giving "misleading answers" on October 23.
Committee chairman Keith Vaz said: "We were appalled by the evidence given by DS Hinton, Sgt Jones and Inspector MacKaill. It is now clear that DS Hinton and Sgt Jones misled the Committee, possibly deliberately.
"We have recalled them to correct the record and if they do not, they will be in prima facie contempt of Parliament."
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