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A plume of smoke rises over the State oil company Petroleos Mexicanos' petrochemical plant in Coatzacoalcos, Mexico, Wednesday April 20, 2016. An explosion ripped through a petrochemical plant on the southern coast of the Gulf of Mexico on Wednesday, killing 3 people, injuring dozens and sending flames and a toxin-filled cloud into the air, officials said. (Photo by Felix Marquez/AP Photo)
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