Scotland Yard are looking into the possibility of criminal charges in the 'Plebgate' affair.
The inquiry, codenamed 'Operation Alice' began after claims that officers involved in the row may have lied about the dispute with Mr Mitchell, when they refused to let him leave Downing Street on his bike through the main gate in September last year.
At the time it was claimed at the time that Mr Mitchell swore at the officers and called them "plebs". He strenuously denies the allegations, and was forced to resign from his post as David Cameron's Chief Whip after a series of damaging headlines.
Deputy Chair of the IPCC Deborah Glass has replied:
While this does not rule out the possibility of the MPS file having been leaked, it also raises other possibilities, either that someone who may have been connected to the investigation or in possession of material had a conversation with a reporter, or that the author/s of the articles were reporting speculatively – I note, for example, the references in both stories to “…it is understood that..."
While I fully understand your concerns about these press reports, it appears to me that the public interest is best served by ensuring that the MPS [Met Police] are indeed carrying out a robust and thorough investigation into the initial incident and its aftermath.
Operation Alice officers were tasked with investigating who passed information to The Sun and The Telegraph newspaper regarding the "Plebgate" incident, including whether the leak came from within the police force or from a third party.
They examined a police witness statement from the incident and investigated if there was a conspiracy between the officer and another party.
They also investigated claims made by Andrew Mitchell that police lied in the police log of the incident.
I've just got off the phone to Andrew Mitchell, the MP accused of calling police officers in Downing Street plebs - which he's always denied.
He told me he was informed by the IPCC yesterday that police files into what happened were about to be handed over to the CPS. He was also contacted earlier today by the police officer in charge to say it was about to happen.