Debris is seen after an explosion at the headquarters of state-owned oil giant Pemex in Mexico City

Debris is seen after an explosion at the headquarters of state-owned oil giant Pemex in Mexico City

Debris is seen after an explosion at the headquarters of state-owned oil giant Pemex in Mexico City January 31, 2013. A powerful explosion rocked the Mexico City headquarters of Pemex on Thursday, killing at least 25 people, injuring more than 100 and trapping others inside. REUTERS/Bernardo Montoya (MEXICO – Tags: DISASTER ENERGY BUSINESS)