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Japan Self-Defense Force (JSDF) soldiers run to assist in a rescue operation near the peak of Mt. Ontake, which straddles Nagano and Gifu prefectures, central Japan, Sept. 29, 2014.

Japan Self-Defense Force (JSDF) soldiers and police officers take part in a rescue operation near the peak of Mount Ontake. More than 500 rescuers resumed the search for victims of the volcano on Monday, central Japan, Sept. 29, 2014.

Volcanic smoke rises from Mount Ontake, which straddles Nagano and Gifu prefectures, central Japan, Sept. 29, 2014.

This aerial picture shows rescue workers and Self Defense Force soldiers searching for missing climbers and survivors among ash-covered mountain cottages and a Shinto shrine (above) on the top of Mount Ontake at Nagano prefecture, Sept. 28, 2014.

Plumes of smoke and ash billow from Mount Ontake in central Japan, Sept. 28, 2014.

Japan Self-Defense Force (JSDF) soldiers and firefighters conduct rescue operations at mountain lodges, covered with volcanic ash as volcanic smoke rises near the peak of Mount Ontake, which straddles Nagano and Gifu prefectures, Sept. 28, 2014.

A hiker is lifted by a rescue helicopter of Japan Self-Defense Force (JSDF) during a rescue operation at Mount Ontake, which straddles Nagano and Gifu prefectures, central Japan, Sept. 28, 2014.

Plumes of smoke billow near a cabin on Mount Ontake in central Japan, one day after it erupted, spewing large white plumes of gas and ash high into the sky and blanketing the surrounding area in ash, Sept. 28, 2014.

A firefighter allows a fire engine onto a restricted road leading to Mount Ontake as firefighters head to the mountain to aid in the rescue efforts of those stranded and injured, in Otaki Village, Nagano prefecture, Japan, Sept. 28, 2014.

A military vehicle prepares to head to rescue climbers on Mount Ontake, background, in Otaki Village, Nagano prefecture, central Japan, Sept. 28, 2014.