At about 10:42 a.m. on the 17th, a pipeline explosion occurred at SK Energy's Ulsan plant in Yongyeon-dong, Nam-gu, Ulsan.

So far, five people have been reported injured: four seriously and one with minor injuries.

A fire breaks out at the SK Energy plant in Ulsan at about 10:42 a.m. on the 17th, and responding firefighters conduct extinguishing operations. /Courtesy of Ulsan Fire Headquarters

The four seriously injured people, reported to have suffered burns, were rushed to burn specialty hospitals in the Busan area.

The explosion is believed to have occurred during scheduled maintenance at a hydrogen production plant. The scheduled maintenance has been underway since the 15th.

Fire authorities said no flames were observed at the scene and that they are currently cooling the exploded pipeline.

Police are investigating the exact extent of the damage and the cause of the fire.

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