South Korea has found no evidence of a massive explosion at a coal mine that killed at least 13 miners and injured more than 300, state media said Thursday.

But a probe by the country’s environmental protection agency found no signs of a toxic spill or accident that triggered the blast, the state-run Yonhap news agency reported.

The blast, which killed the five workers and injured a further 25, took place near the South Korean village of Oyong in the western province of Gyeonggi, Yonhap said.

Yonhap quoted an unnamed environmental protection official as saying investigators had found no toxic spill.

The agency, which has responsibility for overseeing hazardous waste, has launched an investigation into the incident.

It is not known how the blast occurred.

A blast at a South Korean coal mine in the northeastern province of Kyungsan, which took place on July 28, 2017.

(Yonha News Agency/File)The agency’s investigation was conducted after an investigation was launched by the provincial government last week into the accident, Yonha reported.

The South Korean mining company that operated the mine said the blast took place during a drill on the first day of the mine’s annual training.

The accident occurred on the second day of its annual training at the mine in Kyungsan, which was operating as a single mine and had been operated by the mine operator for more than three decades.

According to the mining company, a drill was being conducted at the site when a large blast occurred and the company decided to stop the drill due to safety concerns.

According the report, a company employee who was nearby at the time of the blast told investigators that a loud bang could be heard and that the drill operator rushed to the site, while the others were still working on the drill.

The worker said the drill operation was stopped because of the “toxic explosion,” Yonhap reported.

According on its website, the Oyong mine is one of the world’s largest in terms of coal production.

The mine is located at the edge of the Yoonhyun river, which separates Kyungsun from the rest of the region.

The mine employs nearly 1,200 people.

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