On Friday, Pemex said that the death toll stood at 24, while 19 people remained hospitalized, including 13 in critical condition.
According to Pemex, the explosion at its oil facility in Coatzacoalcos, in the state of Veracruz, occurred at 15:15 local time (20:15 GMT) on Wednesday. The oil plant is operated by the Mexichem petrochemical company and is jointly owned with Pemex.
The cause of the explosion is under investigation.
In February, a fire broke out on a Pemex offshore oil platform in the Gulf of Mexico, injuring several workers and leading to the death of two people. In April 2015, four people died and over a dozen were injured after a fire on the same oil rig.