Blast Rocks Mexico's Pemex Building

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An explosion rocked the skyscraper, leaving up to 25 dead and 101 injured, as a plume of black smoke billowed from the 54-floor tower, January 31, 2013.

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A worker walks past debris piled outside the headquarters of state-owned oil giant Pemex in Mexico City, January 31, 2013.

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Shattered windows are seen on one side of the headquarters of state oil giant Pemex in Mexico City, January 31, 2013.