Firefighters and workers dig for survivors after an explosion took place at the so-called B2 building adjacent to the main Pemex tower in Mexico City on Jan. 31, 2013. Photographer: Guillermo Gutierrez/AP Photo
Firefighters and workers dig for survivors after an explosion took place at the so-called B2 building adjacent to the main Pemex tower in Mexico City on Jan. 31, 2013. Photographer: Guillermo Gutierrez/AP Photo
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