I linked to this article yesterday. [Thankfully] Beware the hype:
In just a few hours, I was able to locate publically available data to support similar analyses for 16 of the 20 most populous cities, and the results, summarized below, suggest a much less pervasive increase than one might infer from the Times analysis.
...
Of course, the lack of compelling evidence of a broad-based increase does not prove that no such increase is occurring. Trends in homicide rates (and crime rates generally) are extremely important topics that warrant further investigation. But before we begin to speculate about causes and potential remedies, we need a more comprehensive understanding of the prevalence and location of increases in homicide rates that actually depart from normal fluctuations. This suggests a need for analyses that span several years, for as many medium- and large-sized jurisdictions as possible. It would also be useful to undertake such analyses for related crimes, such as non-fatal shootings, non-fatal stabbings, and aggravated assaults, since the difference between those and homicides may often be a matter of random luck, the type of weapon readily available, or the distance to the nearest emergency room.
Only then will we be in a position to undertake rigorous efforts to explain the problem and explore potential remedies.