Mexico Says Gas Buildup Caused Deadliest Blast Since 2006

Mexico Says Gas Buildup Caused Deadliest Blast Since 2006

Susana Gonzalez/Bloomberg

A model of the Pemex administrative building sits in the foreground while Mexican Attorney General Jesus Murillo Karam, from left, Pedro Joaquin Coldwell, energy minister, and Emilio Lozoya Austin, chief executive officer of Pemex, hold a news conference in Mexico City, Mexico, on Monday, Feb. 4, 2013.