Officers investigating the row involving former Chief Whip Andrew Mitchell have arrested a second man today. Here is a timeline of events in the "plebgate" affair.
- Sep 19: Andrew Mitchell, with his bike, is told by Downing Street police officers to use a pedestrian gate, not the main one. The officer recorded that Mr Mitchell told him: "Best you learn your f------ place...you're f------ plebs".
- Sep 20: Deputy chief whip John Randall receives an email from a supposed constituent who claimed he and his nephew heard the incident, later revealed by Channel 4 News.
- Sep 21: The Sun newspaper publishes claims that the Conservative MP launched a tirade against police officers.
- Sep 25: The police log is published in the Daily Telegraph. Scotland Yard confirms it will investigate the leak.
- Oct 19: Mr Mitchell resigns as chief whip after admitting he swore at police - contrary to what he told parliament. But he continues to deny using the word pleb. In his resignation letter he wrote: "Whatever the rights and wrongs of the matter I will not be able to fulfil my duties as we (Mitchell and the Prime Minister) would both wish."
- Dec 16: A Metropolitan Police officer is arrested for allegedly leaking the police log to national newspapers.
- Dec 18: CCTV footage obtained by Channel 4 News casts doubts over the police log book leaked to the media.
- Dec 20: A 23-year old man is arrested in connection with the investigation. The man, who is not a member of police staff, has been released on bail.