New York's Broken Windows theory author on tackling crime
David Cameron has promised that the government will not allow a culture of fear to exist on Britain's streets.
The prime minister has promised tough action against those behind the four nights of violence and looting across England.
Police will also be given greater powers to tackle gang culture.
Mr Cameron's stance may have moved closer to the Broken Windows theory that inspired New York Mayor Rudi Giuliani's attitude towards crime.
George Kelling, a Professor Emeritus at Rutgers University who co-wrote the paper, told Up All Night why petty crimes, like broken windows, served as a trigger for criminal behaviour.
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