<p id="docs-internal-guid-341f8155-c13f-aa45-b0b1-ed6c4e791589" dir="ltr"><strong>Japanese authorities rescue hikers on Sunday at a mountain lodge covered in volcanic ash near Mount Ontake in central Japan.</strong></p><p dir="ltr">More than 30 hikers are feared dead on the mountain, after an eruption sent a cloud of ash downslope. The eruption came without notice around noon on Saturday, and Japan's meteorological agency has since issued <a href="http://www.jma.go.jp/en/volcano/">a volcano warning</a>. Experts are warning of potential <a href="http://www3.nhk.or.jp/nhkworld/english/news/20140928_21.html">future eruptions</a>. (See "<a href="http://news.nationalgeographic.com/news/2014/09/140928-japan-volcano-eruption-mount-ontake-science-world/">Explaining Surprise Eruption of Japan Volcano Where Dozens Are Presumed Dead</a>.")</p><p>A popular site for tourists, the volcano last erupted in 2008. With hikers still missing, fatality reports climbed throughout the day on Sunday.</p><p><em>—Photo Gallery by Sherry Brukbacher, Text by Dan Vergano</em></p>

Ash Layer

Japanese authorities rescue hikers on Sunday at a mountain lodge covered in volcanic ash near Mount Ontake in central Japan.

More than 30 hikers are feared dead on the mountain, after an eruption sent a cloud of ash downslope. The eruption came without notice around noon on Saturday, and Japan's meteorological agency has since issued a volcano warning. Experts are warning of potential future eruptions. (See "Explaining Surprise Eruption of Japan Volcano Where Dozens Are Presumed Dead.")

A popular site for tourists, the volcano last erupted in 2008. With hikers still missing, fatality reports climbed throughout the day on Sunday.

—Photo Gallery by Sherry Brukbacher, Text by Dan Vergano

Photograph by Kyodo, Reuters

Pictures: Japanese Volcano That Killed Hikers

Dozens of hikers died after a volcanic eruption in central Japan over the weekend.

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