Seoul: Three South Korean workers died on Friday after apparently inhaling toxic gas at a construction site for a nuclear plant being built by South Korea's monopoly nuclear power company, which has come under recent threats by hackers, a company official said.
The accident at the construction site in the southeastern city of Ulsan came as the state-run Korea Hydro and Nuclear Power Co was on high alert over a series of threats by hackers who claim they can disable the control systems of its plants.
Choi Hee-ye, a company spokeswoman, said there was no reason to believe that today's accident was linked to the cyberattack threats.
The victims were working at the construction site when they fell unconscious and were taken to a hospital, where they later died, Choi said.
The company has yet to determine the cause of the accident, although the leaking of nitrogen was suspected, she said, adding that it wasn't immediately clear how nitrogen was used in the construction process.
Construction of the plant is scheduled to be completed next year.
Last week, documents including layouts of nuclear facilities and personal information of nuclear workers were published online.
Local media said the unidentified people who posted images of the stolen nuclear documents imprinted with "WHO AM I?" on a South Korean blog were hackers. The company said that the safety of the country's nuclear power plants was not affected.
Korea Hydro ran drills on Monday and Tuesday to prepare workers in the event of hacking attacks.