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Mexico's state-owned oil company Pemex reported a fire at its Tula refinery, the latest in a string of recent accidents to hit the company's facilities.
On its Twitter page, Pemex said that one worker was injured.
The fire occurred at the refinery's Hidros 1 plant.
The Tula refinery, located in central Hidalgo state, is the country's second largest with a capacity to process 315,000 barrels of crude oil per day.