Mexican state-owned oil company Petroleos Mexicanos said Thursday it extinguished a fire that broke out at a gasoline storage tank at its Ciudad Madero refinery in the northeastern state of Tamaulipas.

Pemex said in a statement that at 5:50 a.m. it had fully "controlled and extinguished" the blaze that erupted early Wednesday, adding that "no one was seriously injured."

Two workers who sustained slight burns were in "satisfactory" health and continuing to receive hospital treatment, the oil giant said.

Technicians were "still cooling the walls of the tank with water" as a preventive measure even though "normality was restored" at the refinery at 6:42 a.m., Pemex said.

Ciudad Madero emergency services personnel helped control and extinguish the fire, the company said.

Another fire broke out Monday in a remote area in northern Tamaulipas when someone illegally tapped a fuel pipeline, but Pemex workers were able to put out the blaze.

Theft of fuel from Pemex pipelines, known in Mexico as "milking," is common, with both individuals and gangs involved in the illegal activity. EFE