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London Mayor Boris Johnson has become involved in the row about the government's chief whip Andrew Mitchell and police officers guarding Downing Street.
Mr Johnson has backed the police officers who threatened to arrest Mr Mitchell.
The Mayor was speaking after a leak of the official police log of the encounter between the politician and the police.
Mr Mitchell has apologised for his outburst but denies using the words being quoted.
This report from our Political Correspondent Simon Harris.
Speaking at the opening of a library at South Ruislip in north west London, Mr Johnson said people could not swear at police and expect to get away with it.
London Mayor Boris Johnson on the Andrew Mitchell row:
"In my book you shouldn't abuse police officers and I made that clear loads of times. The crucial thing for me is that Andrew Mitchell has now apologised not just once but twice publically. I believe he's also apologised to the officer concerned."
London Mayor Johnson says he was "very interested to see" there was "an offer to arrest Andrew Mitchell".
London Mayor Boris Johnson says Andrew Mitchell's apology "underscores how wrong it is to abuse police officers". Mr Johnson also commented on the police decision not to arrest Mr Mitchell: