Mexico's state-owned oil company says one worker died when a gas leak caught fire and shout out flames at a refinery in the northern state of Tamaulipas.
Petroleos Mexicanos, known as Pemex, said the blast Friday also injured 11 workers at the refinery in Ciudad Madero.
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The company said the blast happened at a coker plant that wasn't operating because of maintenance work being carried out at the time of the accident. The blast didn't start a bigger fire and the installations were not damaged.
Pemex said experts will investigate what caused the accident.