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New sentences for knife crimes in England and Wales

3 December 2012 Last updated at 13:53 GMT

Several new criminal offences and sanctions come into force in England and Wales today, including new tariffs for some knife crimes.

A new offence of aggravated knife crime is among the measures being brought in, as well as mandatory life sentences for anyone committing a second serious violent or sexual offence.

Also introduced by the government are "Extended Determinate Sentences", when offenders must serve at least two-thirds of their prison term.

The BBC's legal correspondent Clive Coleman reports.