A link between drug gangs and murder in Puerto Rico?

From Fox News:

As is common in areas that see a spike in drug trafficking, violence in Puerto Rico has also skyrocketed. The Caribbean averages one murder every 7.5 hours, and half of them are linked to drug trafficking. . . .

Apparently, the claim is that Puerto Rico had a murder rate of 26.4 per 100,000 in 2010, which is about five times higher than the US rate.  


Murder: PR: 26.4 per 100,000 US: 4.8
Robbery: PR: 176.8 per 100,000 US: 119.1
Rape: PR: 1.1 per 100,000 US: 27.5
Aggravated Assault: PR: 73.8 per 100,000 US: 252.3
Burglary: PR: 479.9 per 100,000 US: 699.6
Theft: PR: 729.5 per 100,000 US: 2,003.5
Auto theft: PR:182.8 per 100,000 US: 238.8