On Tuesday, three people died in an area with a high concentration of toxic gas near a hot spring resort in Fukushima, northeastern Japan, local fire authorities reported.
The three were found collapsed near the hot spring resort and were later confirmed dead.
They were found during a search for the manager, in his 60s, and two employees, in their 50s and 60s, of a hotel in the Takayu Onsen area in Fukushima.
The three had gone missing the previous evening after entering the nearby mountains for hot spring maintenance work.
The area had a high concentration of gases, including hydrogen sulfide, according to the authorities.
As of 7:30 a.m., snow accumulation in the area reached 146 centimeters, while the temperature was minus 7.7 C.