The Americas

Death toll at 28 in Mexico petrochemical plant explosion

  • BEST QUALITY AVAILABLE  - In this video grab a large plume of smoke rises from the Mexican State oil company Petroleos Mexicanos' petrochemical plant after an explosion in Coatzacoalcos, Mexico, Wednesday, April 20, 2016. The explosion killed several people, injuring dozens and sending flames and a toxin-filled cloud into the air, officials said. (Inmel Enoc via AP)

    BEST QUALITY AVAILABLE - In this video grab a large plume of smoke rises from the Mexican State oil company Petroleos Mexicanos' petrochemical plant after an explosion in Coatzacoalcos, Mexico, Wednesday, April 20, 2016. The explosion killed several people, injuring dozens and sending flames and a toxin-filled cloud into the air, officials said. (Inmel Enoc via AP)  (The Associated Press)

  • A plume of smoke rises over the State oil company Petroleos Mexicanos' petrochemical plant in Coatzacoalcos, Mexico, Wednesday April 20, 2016. An explosion ripped through a petrochemical plant on the southern coast of the Gulf of Mexico on Wednesday, killing 3 people, injuring dozens and sending flames and a toxin-filled cloud into the air, officials said. (AP Photo/Felix Marquez)

    A plume of smoke rises over the State oil company Petroleos Mexicanos' petrochemical plant in Coatzacoalcos, Mexico, Wednesday April 20, 2016. An explosion ripped through a petrochemical plant on the southern coast of the Gulf of Mexico on Wednesday, killing 3 people, injuring dozens and sending flames and a toxin-filled cloud into the air, officials said. (AP Photo/Felix Marquez)  (The Associated Press)

Searchers recovered four more bodies from a petrochemical plant wrecked by a huge explosion this week on Mexico's southeastern Gulf coast, raising the death toll to 28, the state oil company said Friday night.

Petroleos Mexicanos said in a statement that some workers were still missing, but did not specify a number. It had said Thursday that eight workers were unaccounted for.

Pemex said some areas of the plant had not yet been searched. Earlier in the day, it said drones and tracker dogs were aiding the search.

The company said 18 people were still hospitalized. More than 130 people in all suffered various injuries Wednesday when the explosion rocked the plant in Coatzacoalcos, about 600 kilometers (370 miles) southeast of Mexico City.

Pemex has said the explosion happened after a leak but has not determined the source.

The Clorados 3 plant of Petroquimica Mexicana de Vinilo produces the hazardous industrial chemical vinyl chloride.