Secretary of Defense nominee Chuck Hagel testifies Thursday before the Senate Armed Services Committee during his confirmation hearing. Alex Wong/Getty Images hide caption

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Firefighters belonging to the Tacubaya sector and workers dig for survivors after an explosion at a building adjacent to the executive tower of Mexico's state-owned oil company PEMEX. Guillermo Gutierrez/AP hide caption

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Armando Tenorio at his home in Mexico last December. Tenorio spends most of the year working on a blueberry farm in Canada, on a temporary work permit, to support his family in Mexico. Dominic Bracco II/The Washington Post/Getty Images hide caption

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Brazilian federal police patrol the Mamore River, which separates Brazil from Bolivia. The river is used by traffickers to ferry cocaine from Bolivia into Brazil, where cocaine consumption is rising rapidly. Juan Forero/Getty Images hide caption

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Handguns collected in South-Central Los Angeles as part of a Gun for Gift Card exchange in 2009. One teenager here says getting a gun on the streets is just "one phone call away." Mark Ralston/AFP/Getty Images hide caption

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