The policeman at the centre of the 'Plebgate' row involving former Government Chief Whip Andrew Mitchell has been named by the Mail on Sunday newspaper.
The newspaper claims the officer can be seen on CCTV footage ushering Mitchell out of the Downing Street gates during the alleged 'Plebgate' incident and that he was also the author of the police log that documented the exchanges between the pair.
The Mail on Sunday also names the man who sent a letter of complaint about the incident to an MP.
The newspaper states he is related to a second man - a 23-year-old who is not a member of police staff - who has also been arrested over the affair.
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.