Andrew Mitchell
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Andrew Mitchell under pressure after police outburst

Pressure is mounting on Conservative minister Andrew Mitchell after police leaders urged him to resign over an outburst at police officers.

The Tory Chief Whip denies claims he swore at a policeman on duty outside Downing Street and called him a "pleb".

The officer concerned has insisted reports of what happened are accurate.

David Cameron condemned the behaviour as 'wrong' and 'inappropriate'.

Carole Walker reports.