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Construction work on an underground storage tank in South Korea has been indefinitely halted after a deadly blast.

According to Reuters, South Korea’s Korea National Oil Corp. has stopped construction work on the 10.3 million barrel storage tank after two people caught in the blast died over the weekend.

The explosion happened last Friday in the city of Ulsan while workers were replacing a crude pipe.

Four other people were injured during the incident, Reuters said.

Further details about the accident have not been disclosed yet.

A KNOC spokesperson told Reuters that the labor ministry told the firm to suspend construction work on the storage tank “for safety reasons.”

Construction work began in January and the project was expected to be complete by December 2020.

KNOC does not yet have a timeline for restarting construction work.