'Plebgate' evidence sent to CPS 28 March 2013 Last updated at 17:39 Police investigating claims that a Cabinet minister called officers "plebs" say they have passed evidence to prosecutors. Four people have so far been arrested after an investigation into the incident which happened in Downing Street in September last year. Initial reports had said that Andrew Mitchell, who was chief whip, lost his temper and swore at police when they refused to open the gates for him as he cycled out. He resigned from the Cabinet, but Mr Mitchell denied directly swearing at the officer and insisted he did not lose his temper or call the officer a "pleb." CCTV footage of the incident cast doubt on the police reports. A CPS spokesperson said: "We have received initial papers but we have not received a full file of evidence and we now await the conclusion of the police investigation before considering charges." Last month a 46-year-old woman who is a member of the diplomatic protection group and was in Downing Street during the alleged incident, was held in connection with the unauthorised disclosure of information to the media. That followed the questioning of two other members of the same unit on suspicion of misconduct in a public office, and the arrest of a 23-year-old man - not a member of the police force - on suspicion of "intentionally encouraging or assisting the commission of an indictable offence."