Signs point to tourist destinations outside a Burger King in London. michaelpickard/Flickr hide caption

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Rescue workers are searching the debris in Mexico City, where an explosion Thursday rocked the headquarters of the state-owned oil company, Pemex. Yuri Cortez/AFP/Getty Images hide caption

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Secretary of State Hillary Clinton at a town hall meeting on Tuesday in Washington, D.C. She officially leaves her post on Friday. Mandel Ngan/AFP/Getty Images 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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