State police officers patrol a highway between Ciudad Victoria and Matamoros, in northeast Mexico, in 2011. Mexico's drug and turf wars have descended on the once tourist friendly border town of Matamoros. Alexandre Meneghini/AP hide caption

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A Mexican guard at a prison in Tijuana where 17 men are being held on charges they were digging a drug-smuggling tunnel from Tijuana to the U.S. border at San Diego. The men say they were kidnapped and forced to do the work. Special to NPR hide caption

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