Pemex Combs Rubble for Cause of Deadliest Blast Since 2006

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The probe into a blast that tore the face off a building at Petroleos Mexicanos’s Mexico City headquarters and killed at least 33 people continued, with authorities saying they still don’t know what happened.

Forensic, chemical and explosive experts were sifting through clues and haven’t identified the cause of the disaster at the state-owned oil company’s office on Jan. 31, Attorney General Jesus Murillo Karam said yesterday. Pemex has stepped up security at oil production facilities during the investigation, the company said.