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.<br />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. <br />The ten students were taken to hospital where one of them regained consciousness.<br />An investigation found eight times the normal level of carbon monoxide in the room. <br />
