480 homicides (9.4%) were in Chicago
344 homicides (6.7%) were in Baltimore
333 homicides (6.5%) were in Detroit
119 homicides (2.3%) were in Washington D.C. (a 54% increase over prior years)
So basically, 25% of all gun crime happens in just 4 cities. All 4 of those cities have strict gun laws, so it is not the lack of law that is the root cause.
I understated it then. Child gun violence is highly location dependent in areas with gun free zones.