Workers walk past rubble of the damaged building of Mexican... News PhotoAccidents and Disasters,Damaged,Government,Horizontal,Latin America,Mexico,Mexico City,Occupation,Petroleos Mexicanos,Rubble,WalkingPhotographer Collection: AFP 2013 AFPWorkers walk past rubble of the damaged building of Mexican state-owned oil giant Pemex, after a blast, in Mexico City on February 5, 2013. A gas build-up caused the explosion that rocked the headquarters of Mexico's state-owned oil firm last week, killing 37 people, officials said Monday, ruling out a bomb attack. The explosion also injured morfe than 120 people. AFP PHOTO/Alredo Estrella (Photo credit should read ALFREDO ESTRELLA/AFP/Getty Images)