Gun crimes with stolen weapons

Are there any statistics about the proportion of crimes where the perpetrator used a firearm where the firearm was stolen or had otherwise been obtained through extra-legal means?

Thanks,
Rob

I am not sure if it has been quantified anywhere, but quite a lot of gang on gang violence is committed by teenagers, who are not legally able to obtain firearms.

Here in Omaha, by mid July 2010 there had been eighteen homicides. Twelve of those homicides were considered gang related.

Cite from the Omaha World Herald

The article goes on to describe the problem of the increase in gang violence as a general whole: