An employee culls through debris searching for office documents amid the rubble left from an office building explosion, in Mexico City, Saturday, Feb. 2, 2013. A Thursday blast collapsed the lower floors of the Mexican state-owned oil company Petroleos Mexicanos, or Pemex, headquarters, crushing at least 33 people beneath tons of rubble and injuring 121. A Pemex spokesman said the floors hit by the explosion housed administrative offices. (AP Photo/Marco Ugarte)

Associated Press
An employee culls through debris searching for office documents amid the rubble left from an office building explosion, in Mexico City, Saturday, Feb. 2, 2013.  A Thursday blast collapsed the lower floors of the Mexican state-owned oil company Petroleos Mexicanos, or Pemex, headquarters, crushing at least 33 people beneath tons of rubble and injuring 121. A Pemex spokesman said the floors hit by the explosion housed administrative offices. (AP Photo/Marco Ugarte)
An employee culls through debris searching for office documents amid the rubble left from an office building explosion, in Mexico City, Saturday, Feb. 2, 2013. A Thursday blast collapsed the lower floors of the Mexican state-owned oil company Petroleos Mexicanos, or Pemex, headquarters, crushing at least 33 people beneath tons of rubble and injuring 121. A Pemex spokesman said the floors hit by the explosion housed administrative offices. (AP Photo/Marco Ugarte)
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