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Five workers were injured Thursday after a fire broke out at the Pemex operated Lazaro Cardenas refinery in Minatitlan on Mexico’s Gulf Coast.

According to Reuters, four workers suffered burn injuries after a fire broke out in a catalytic plant that was closed for maintenance.

A fifth worker was injured after falling while operating a fire hose.

The fire has been extinguished and the rest of the refinery, located in Veracruz, is operating normally, Retuers said.

As of 2012, the refinery had a capacity of 246,000 barrels per day.

The same plant was hit by another blaze in September, Reuters added.

The Lazaro Cardenas blaze is the second Pemex refinery fire in less than a month.

In November, a blaze at Mexico’s largest refinery, located in the state of Oaxaca, injured at least eight people and forced some staff to be evacuated.

That accident came on the heels of a Pemex report that claimed the company reduced its overall accident rate by 33 percent in 2014.

In July, Reuters questioned the way Pemex reported its accident rate.

The company had said the rate fell to 0.38 accidents per million man-hours worked, falling below the average accident rate reported by the International Association of Oil and Gas Producers.

Reuters said Pemex included man hours worked by office staff in its calculations to reduce its overall accident rate.