A soldier stands guard outside the Pemex headquarters after an explosion in Mexico City, Thursday, Jan. 31, 2013. Mexico's stated-owned oil company says an explosion at its headquarters in the capital... more 
A soldier stands guard outside the Pemex headquarters after an explosion in Mexico City, Thursday, Jan. 31, 2013. Mexico's stated-owned oil company says an explosion at its headquarters in the capital has left several workers injured. (AP Photo/Eduardo Verdugo) less 
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Associated Press | Photo By Eduardo Verdugo
Thu, Jan 31, 2013 6:27 PM EST