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Police say almost all those killed on volcano died of injuries from being hit by rocks

  • Rescuers conduct a search operation near the peak of ash-covered Mount Ontake in central Japan, Thursday, Oct. 2, 2014. Saturday's eruption on Mount Ontake was the worst fatal eruption in postwar history in Japan. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT

    Rescuers conduct a search operation near the peak of ash-covered Mount Ontake in central Japan, Thursday, Oct. 2, 2014. Saturday's eruption on Mount Ontake was the worst fatal eruption in postwar history in Japan. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT  (The Associated Press)

  • Rescuers, center, climb Mount Ontake covered by volcanic smoke and clouds for a search operation in central Japan, Thursday, Oct. 2, 2014. Saturday's eruption on Mount Ontake was the worst fatal eruption in postwar history in Japan. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT

    Rescuers, center, climb Mount Ontake covered by volcanic smoke and clouds for a search operation in central Japan, Thursday, Oct. 2, 2014. Saturday's eruption on Mount Ontake was the worst fatal eruption in postwar history in Japan. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT  (The Associated Press)

  • In this Wednesday, Oct. 1, 2014 photo released by Nagoya City Fire Dept., Nagoya City firefighters conduct a search operation near the peak of Mount Ontake in central Japan. Saturday's eruption on Mount Ontake was the worst fatal eruption in postwar history in Japan. (AP Photo/Nagoya City Fire Dept.) MANDATORY CREDIT

    In this Wednesday, Oct. 1, 2014 photo released by Nagoya City Fire Dept., Nagoya City firefighters conduct a search operation near the peak of Mount Ontake in central Japan. Saturday's eruption on Mount Ontake was the worst fatal eruption in postwar history in Japan. (AP Photo/Nagoya City Fire Dept.) MANDATORY CREDIT  (The Associated Press)

Police say it's been determined that almost all of the people killed on a Japanese volcano died of injuries from being hit by volcanic rocks that flew out during its eruption.

Rescuers have retrieved 47 bodies from the ash-covered summit area of Mount Ontake since Saturday's eruption.

Nagano prefectural police said Thursday that doctors concluded that all but one of the bodies showed signs of having been hit by volcanic boulders and rocks. They said the other victim died of burns from inhaling hot air.

Most of the bodies were found near the summit, where many climbers were resting or having lunch. The search for more bodies continued Thursday, but ended early due to bad weather.

Authorities continued to look into the possibility that about 20 people were still missing.