Three people have died and two others are still in critical state after a suspected carbon monoxide leak on Tuesday at a guesthouse in Gangneung.
They were among ten high school students from Seoul.... who were staying in the guesthouse in Gangneung, Gangwon-do Province.... when the owner found them lying unconscious in their room on Tuesday afternoon.
The ten students were taken to hospital where one of them regained consciousness.
An investigation found eight times the normal level of carbon monoxide in the room.