A 37-year-old police constable in the diplomatic protection group has been arrested on suspicion of misconduct in public office over the Andrew Mitchell "Plebgate" affair, Scotland Yard has said.
A 46-year-old woman has also been arrested on suspicion of assisting the commission of an offence of misconduct in a public office.
The arrests were made under Operation Alice, the investigation into whether officers lied about a dispute which led to Mr Mitchell being forced to quit the Cabinet.
They have been taken to separate police stations where they remain in custody.
The Independent Police Complaints Commission, who continue to supervise the investigation, has been informed.
A diplomatic protection group police officer and a 49-year-old woman have been bailed following their arrests over the "plebgate" affair, Scotland Yard said.
The pair were held yesterday as part of Operation Alice, the investigation into whether officers lied about a dispute which led to the Tory MP Andrew Mitchell being forced to quit the Cabinet.
The police constable was released from custody today after being questioned on suspicion of misconduct in a public office.
A police officer has been arrested in connection with the Sutton Coldfield MP Andrew Mitchell "Plebgate" affair.
The 48-year-old police constable was held on suspicion of misconduct in a public office this morning as part of the investigation into whether officers lied about a dispute which led to the Tory MP being forced to quit the Cabinet.
A 49-year-old woman - who is not a police officer - was arrested at a separate address on suspicion of assisting an offender.
The MP for Sutton Coldfield and Government Chief Whip Andrew Mitchell has agreed to meet representatives of the Warwickshire, West Mercia and West Midlands Police Federation over comments he allegedly made about a police constable.
The Chairman of the West Midlands Police Federation Ian Edwards said that:
"We hope that we can get to the bottom on of the PC Pleb row and then put it behind us. The meeting with Mr Mitchell, a senior member of the Government, will also give us a chance to discuss our concerns about police cuts."
The meeting will take place on 12 October 2012.
The Police Federation launched an advertising campaign last week opposing the Governments's cuts to police budgets with officers wearing PC Pleb T-shirts.