  The recent quantitative approaches for studing several aspects of urban life
and infrastructure have shown that scale properties allow to understand many
features of urban infrastructure and of human activity in cities. In this work,
an analysis based on the complexity of cities network is performed for data on
Brazilian cities firearms homicides. Due to the diversity in Brazilian
population and cities, this is an interesting test for theories recently
proposed. The superlinear power-law behavior for number of homicides as a
function of city population, with exponent $\beta=1.15$ is obtained. The
hypothesis that fractal structures can be formed in cities as well as in larger
networks is tested, indicating that indeed self-similarity may be found in
networks connecting several cities.
