LG Display Co. said in a statement Monday that the victims, employed by a LG contractor, were carrying out a regular repair and maintenance work when the nitrogen leak occurred not long after midday at the factory in Paju city.
It said one of the four people sickened was seriously ill but not in a life-threatening condition.
The company expressed regret over the deaths.
It said it will cooperate with authorities to find out the cause of the leak.
Developing.
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