BERASTAGI, Indonesia (AP) — Rescuers in Indonesia are searching for a German hiker who went missing while climbing a dormant volcano.

Rescue official Budiawan said Monday that 49-year-old Wolter Klaus was climbing 2,200-meter (7,200-foot) Mount Sibayak in western Indonesia on what should have been a day hike.

Budiawan said Klaus registered his name when he began the hike last Wednesday and was reported missing by his hotel a day later.

About 150 people have been mobilized to search for Klaus. A helicopter supported their efforts on Monday, but the rugged, forested terrain and bad weather were hampering the search.

Mount Sibayak’s last major eruption was in 1881, but its geothermal activity remains high.

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