Mexico City, Jul 23 (EFE).- Nine workers were injured when a gasoline storage tank at the refinery operated by state-owned oil giant Petroleos Mexicanos, or Pemex, in Ciudad Madero, a city in the northeastern state of Tamaulipas, burst into flames, officials said Wednesday.
Two workers suffered "slight burns" and seven others had to be treated for dehydration and exhaustion, Pemex said in a Twitter posting.
"We carried out the fire control and suppression work at a gasoline storage tank at the Ciudad Madero refinery," Pemex said.
The Internal Emergency Response Plan was implemented as soon as the fire started at the refinery on the Gulf of Mexico, the state-owned energy company said.
Ciudad Madero emergency services personnel helped control and extinguish the fire, Pemex said.
The cause of the fire has not been determined, the state-owned oil company said.
A fire started Monday in a remote area in northern Tamaulipas when someone illegally tapped a fuel pipeline, but Pemex workers were able to put out the fire.
Theft of fuel from Pemex pipelines, known in Mexico as "milking," is common, with both individuals and gangs involved in the illegal activity.