The incident occurred at the Petróleos Mexicano (Pemex) refinery named after former Mexican President Lazaro Cardenas. Black smoke, flames and repeated explosions can be seen and heard in videos that have made rounds on social media on Wednesday.
Mexico’s safety, energy and environment regulator ASEA reported that the blaze started in a gasoline transfer pump. The watchdog said that it would inspect the facility in wake of the fire to “verify security conditions.”
One photograph in particular is going viral, showing a Pemex worker scrambling to shut off a valve as a fireball explodes behind him.