David Cameron is expected to say in a speech today that the recent riots across some cities in England have been "a wake-up call for our country" and that "our security fight-back must be matched by a social fight-back".

Home affairs correspondent Mark Easton explores the pros and cons of an "aggressive" zero tolerance approach.

And Karyn McCluskey, director of Scotland's Violence Reduction Unit, considers the best way to introduce a "tough enforcement" method.

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