On Tuesday 25 September, the Cabinet Secretary Jeremy Heywood became aware of a discrepancy between the CCTV footage of the incident involving and the police log.
He was asked by the Public Administration Select Committee, if he had shared his concerns with the police at the time.
He said: "No, my report was to the Prime Minister not to the police".
Britain's most senior police officer has promised a "ruthless" investigation into an alleged conspiracy against Andrew Mitchell.
Andrew Mitchell has written a piece in which he has accused the police of trying to destroy his career in a smear campaign.
Police investigating the row involving Andrew Mitchell have arrested a second man today. See how the "plebgate" events unfolded.