A man pours gas into the tank of his car in Tripoli on Saturday. Residents in the Libyan capital are scrambling to get basic supplies, such as fuel and water. Sergey Ponomarev/AP hide caption

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Mexican federal police man a checkpoint in downtown Juarez, Mexico, on July 13. Despite being hard hit by drug violence, Mexican border cities remain attractive to foreign businesses seeking cheap labor and easy access to the U.S. Jesus Alcazar/AFP/Getty Images hide caption

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Ana Isela Martinez Amaya, a teacher at an El Paso school, spent more than a month in a Juarez jail after Mexican police found drugs in her car at the Mexico-U.S. border crossing. But FBI agents uncovered a complex drug operation that involved tracking Ford cars and copying their keys. Their investigation ultimately led to charges against Martinez being dropped. Jesus Alcazar/AFP/Getty Images hide caption

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Migrants ride on top of a northern bound train toward the U.S.-Mexico border in Oaxaca, southern Mexico, in March. Migrants crossing Mexico to get to the U.S. have increasingly become targets of criminal gangs who kidnap them to obtain ransom money. Eduardo Verdugo/AP hide caption

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NPR reporter Jason Beaubien walks on railroad tracks while reporting a story about the dangers that face Central American migrants in Tenosique, Tabasco, Mexico. David Rochkind for NPR hide caption

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Undocumented Mexican immigrants walk through the Sonoran Desert after crossing the U.S.-Mexico border. Migrants attempting to cross are at risk of being kidnapped, extorted or even killed by drug gangs. John Moore/Getty Images hide caption

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Police officers stand next to a hole they say was used as a mass grave near San Fernando in the Mexican state of Tamaulipas in late April. Almost 200 bodies were found that month in Tamaulipas. Prosecutors believe the killings were carried out by members of the Zetas drug cartel. Alexandre Meneghini/AP hide caption

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Migrants ride on top of a freight train in the Mexican state of Tabasco. They'll hop trains for days, possibly even weeks, before getting to the U.S. border. David Rochkind for NPR hide caption

itoggle caption David Rochkind for NPR

Mexican soldiers have taken control of the police department in downtown Matamoros, in the border state of Tamaulipas. Jason Beaubien/NPR hide caption

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Saul Alvarez of Mexico (right) lands a punch before knocking out opponent Carlos Baldomir of Argentina at a fight in 2010. In March, Alvarez became the WBC super welterweight champion and will defend the title Saturday in his hometown of Guadalajara. Mark Ralston/AFP/Getty Images hide caption

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Julian Leyzaola, police chief of Juarez, says bringing crime down and cleaning up the police force should be much easier than it was in Tijuana, where he spent three years as the top cop. Juan Carlos Llorca/AP hide caption

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