Pemex, the state-run oil company of Mexico, has begun restoring production at its the damaged Gulf of Mexico platform, while continuing its search for three missing workers.

A fire at its Abkatun platform had killed four others.

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Pemex expects to restore 80% of the pre-fire production by next week. By Monday, it had begun processing 170,000 barrels of crude.

"The cause of the accident is still being probed."

The Abkatun rig was handling 220,000 barrels of crude when a fire hit, which led to the evacuation of 301 workers. Some had to jump into the sea to escape the fire.

Pemex general director of exploration and production Gustavo Hernandez was reported by Associated Press as saying that the cause of the accident is still being probed.

The accident will not have an impact on the production forecast of 646,000 barrels of crude a day, and 1.4 billion cubic feet of gas.

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Meanwhile, there have been searches for the three missing workers, of which one is an employee of Pemex, while the other two work for its contractor Cotemar.

"The effort won’t stop until we find them," Hernandez said.

The Abkatun A platform is involved in the separation of gas, oil and other petroleum products, and pumps the refined products to refineries onshore.

The Abkatun platform lies off the coast of Campeche and Tabasco, two Mexican states.

Pemex has reportedly faced several accidents in recent years; a total of 37 people were killed in 2013 due to a blast at the company’s Mexico City headquarters, and in September 2012, a fire at a Pemex natural gas facility in northern Mexico killed 26 people.