AS THE tally of murders linked to organised crime has risen over the past four years in Mexico, analysts have warned that insecurity is spreading to areas that were previously unaffected. The Mexican government insists that, on the contrary, the violence remains highly concentrated. Who is right? The answer, oddly, is both. In 2007, the first full year of the crackdown against the “cartels”, as the mafias are known, 70% of homicides linked to organised crime took place in just 4% of the country’s municipalities. In 2010, again, 70% of killings took place in only 3% of municipalities. If anything, the violence has become slightly more concentrated over time. But total annual killings have risen dramatically. The total for 2010 was more than five times that of 2007 (though there was an encouraging dip towards the end of the year). So although 97% of the country still sees only 30% of all the violence, that 30% represents a much larger number in gross terms than it did four years ago. The map above illustrates the paradox that violence in Mexico has spread extensively, while remaining highly concentrated.