Blast Rocks Mexico's Pemex Building

Rescue workers search for victims at the headquarters of state-owned Mexican oil giant Pemex in Mexico City following a blast inside the building, January 31, 2013.

Rescue workers carry an injured survivor after an explosion in a building at Mexico's state-owned oil company PEMEX complex, in Mexico City, January 31, 2013.

Relatives of Pemex's employees wait for information of their family members outside Pemex hospital in Azcapotzalco in Mexico City, January 31, 2013.

The Minister of the Interior, Miguel Angel Osorio Chong (C) addresses a press conference at the headquarters of state-owned Mexican oil giant Pemex in Mexico City following a blast inside the building, January 31, 2013.

An explosion rocked the skyscraper, leaving up to 25 dead and 101 injured, as a plume of black smoke billowed from the 54-floor tower, January 31, 2013.

A worker walks past debris piled outside the headquarters of state-owned oil giant Pemex in Mexico City, January 31, 2013.

Shattered windows are seen on one side of the headquarters of state oil giant Pemex in Mexico City, January 31, 2013.