An intense blaze lit up the sky early on Saturday at the largest refinery belonging to Mexican national oil company Pemex, according to a state emergency services agency, which said the fire was still active but had been brought under control.
Local and social media published images of bright orange flames burning near the facility's distillation towers from early on Saturday.
It was unclear if the fire has caused any injuries or hit the refinery's operations.
Pemex's press office did not immediately respond to requests for additional information about the incident.
The Salina Cruz refinery, on the coast of southern Oaxaca state, can process up to 330,000 barrels of crude oil per day.
Oaxaca emergency services agency CEPCO said in a brief statement posted on social media that it was monitoring the fire and that preliminary information indicated that it had been "controlled but is still active."
(Reporting by David Alire Garcia; Editing by Daniel Wallis)
.jpg?w=600)
