Guns From America Fuel Jamaica's Gang Wars

Besides coming in on freighters, authorities say, guns are stolen or purchased from crooked police or in "guns-for-ganja" deals by fishermen, who bring homegrown marijuana to nearby Haiti and return with pistols, revolvers and submachine guns — many of them believed to be from the U.S. as well.

Callender's ICE unit began investigations in Jamaica last year with a focus on guns. He said agents in Miami and New York have been working to "interject themselves" into the shipping networks. Indictments are imminent in two or three cases involving suspected Jamaican traffickers inside the U.S., he said, without elaborating.

Then there's the $45 million Caribbean Basin Security Initiative on regional security, announced by U.S. President Barack Obama in April, which is designed to help the islands counter any spillover of violence from Mexico.

Meanwhile, at the ports, Jamaican customs officials are training more spotters to patrol the warehouses, including five in Kingston who process an average of 10 shipping containers daily.

But inspectors feel the odds are still stacked against them.

"The guys we're up against, they have time, they have money, and they are very resourceful," said Andrew Lamb, a supervisor with Jamaica customs' Contraband Enforcement Team. "They're pretty good at what they do."