Mitchell: Pleb claims were an attempt to ruin my career

Andrew Mitchell, who lost his job over claims he called police officers in Downing Street 'plebs', says the allegations were a deliberate attempt to ruin his career.

The former chief whip also said the smears were designed to damage the Conservative Party.

Today the head of Scotland Yard has promised a "ruthless" search for the truth.

Political Correspondent Alex Forrest reports: