GUN crime is heavily concentrated in a few areas of Sydney - the Fairfield area has recorded more than 400 incidents in the last six years, compared to just five in Hunters Hill.

A breakdown of official figures shows that gun crime has fallen across Sydney. Nevertheless, the director of the NSW Bureau of Crime Statistics and Research, Don Weatherburn, said it was a concern that so much of it was occurring in only a few areas.

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''This is a serious problem,'' Dr Weatherburn said.

''It's not one that's getting worse but it's one that needs focused attention - not because it is prevalent but because it's still lethal.''