A firefighter checks toxic gas levels during rescue operations near the peak of Mt. Ontake, which straddles Nagano and Gifu prefectures, central Japan, in this handout photograph released by Nagoya City Fire Bureau and taken September 28, 2014. Search and recovery efforts for at least two dozen victims of Japan's worst volcanic eruption in decades were called off on Tuesday due to worries about rising volcanic activity, including the chance of another steam explosion. (Photo by Reuters/Nagoya City Fire Bureau)
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