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The market for illegal drugs globally is a multi-billion dollar enterprise, with profits flowing mainly to drug traffickers. In 2006, Mexico's President Felipe Calderon declared war on his own country's powerful cartels. As Mexican forces pursued them, rival gangs clashed over territory, and civilians were caught in the crossfire. Meanwhile, emboldened, cartels have expanded into Central America. As long as demand for drugs remains high, there's incentive to provide the supply.

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Migrants face new dangers. (SERGIO HERNANDEZ VEGA/AFP/Getty Images)

On Location: Ixtepec — Ruthless kidnappings on the migrant train

Mexican drug gangs promise murder if they don't receive ransom money

IXTEPEC — Last year there were 20,000 kidnappings of migrants trying to make their way across Mexico to the United States.