Mount Semeru, one of Indonesia's most active volcanoes, erupted on Saturday, December 4, shooting out smoldering hot ash in East Java's Lumajang district.

Rescue workers are still digging through thick layers of ash and debris to find survivors. More than a dozen people have died as of Monday, and at least two dozen more are missing, according to emergency responders.

More than 1,700 people have been evacuated from the area, authorities said, and the debris has damaged 38 schools and nearly 3,000 houses.

A man stands amid houses that were covered by volcanic ash in the village of Sumberwuluh.
A man stands amid houses that were covered by volcanic ash in the village of Sumberwuluh.
Antara Foto/Umarul Faruq/Reuters
Mount Semeru spews volcanic ash on Saturday. Indonesia sits between two continental plates on what is known as the Ring of Fire, a band around the basin of the Pacific Ocean that leads to high levels of tectonic and volcanic activity.
Mount Semeru spews volcanic ash on Saturday. Indonesia sits between two continental plates on what is known as the Ring of Fire, a band around the basin of the Pacific Ocean that leads to high levels of tectonic and volcanic activity.
Antara Foto/National Disaster Mitigation Agency (BNPB)/Reuters
Members of a search-and-rescue team carry a dead body at the Sumberwuluh village on Monday.
Members of a search-and-rescue team carry a dead body at the Sumberwuluh village on Monday.
Adek Berry/AFP/Getty Images
A damaged area of Curah Roboan is seen empty on Monday. Many places have been evacuated near the volcano.
A damaged area of Curah Roboan is seen empty on Monday. Many places have been evacuated near the volcano.
Willy Kurniawan/Reuters
A seismograph reflects Mount Semeru's activity on Monday.
A seismograph reflects Mount Semeru's activity on Monday.
Willy Kurniawan/Reuters
A man inspects a truck buried in the ash on Sunday.
A man inspects a truck buried in the ash on Sunday.
Trisnadi/AP
Nearly 3,000 houses have been damaged by the volcano.
Nearly 3,000 houses have been damaged by the volcano.
Antara Foto/Zabur Karuru/Reuters
Villagers gather at a makeshift shelter in the Sumberwuluh village on Monday.
Villagers gather at a makeshift shelter in the Sumberwuluh village on Monday.
Juni Kriswanto/AFP/Getty Images
A part of the Sumberwuluh village is covered in ash on Sunday.
A part of the Sumberwuluh village is covered in ash on Sunday.
Juni Kriswanto/AFP/Getty Images
An area of Sumberwuluh is covered in ash on Sunday.
An area of Sumberwuluh is covered in ash on Sunday.
Juni Kriswanto/AFP/Getty Images
A man inspects dead livestock next to residential areas that had been buried by ash in Sumberwuluh.
A man inspects dead livestock next to residential areas that had been buried by ash in Sumberwuluh.
Juni Kriswanto/AFP/Getty Images
Indonesian military officers carry livestock away from the evacuation zone on Monday.
Indonesian military officers carry livestock away from the evacuation zone on Monday.
Antara Foto/Zabur Karuru/Reuters
A victim's foot is uncovered by rescue workers on Monday.
A victim's foot is uncovered by rescue workers on Monday.
Willy Kurniawan/Reuters
A man looking for his goat walks in Curah Roboan on Monday.
A man looking for his goat walks in Curah Roboan on Monday.
Willy Kurniawan/Reuters
A view of Mount Semeru on Monday, as seen from the village of Pronojiwo.
A view of Mount Semeru on Monday, as seen from the village of Pronojiwo.
Antara Foto/Zabur Karuru/Reuters
Rescue workers transport a victim in Sumberwuluh on Sunday.
Rescue workers transport a victim in Sumberwuluh on Sunday.
Juni Kriswanto/AFP/Getty Images
This aerial photo, taken on Monday, shows houses and trucks covered by ash in Sumberwuluh.
This aerial photo, taken on Monday, shows houses and trucks covered by ash in Sumberwuluh.
Adek Berry/AFP/Getty Images
Villagers gather at a shelter in Sumberwuluh.
Villagers gather at a shelter in Sumberwuluh.
Juni Kriswanto/AFP/Getty Images
An Indonesian rescue officer stands among trees covered with volcanic ash as he looks for a victim in Sumberwuluh.
An Indonesian rescue officer stands among trees covered with volcanic ash as he looks for a victim in Sumberwuluh.
Zabur Karuru/Antara Foto/Reuters
People inspect an ash-covered area of Sumberwuluh.
People inspect an ash-covered area of Sumberwuluh.
Juni Kriswanto/AFP/Getty Images
Siti Animah, 42, gathers usable goods from her damaged house Curah Kobokan village, Pronojiwo district, on Tuesday.
Siti Animah, 42, gathers usable goods from her damaged house Curah Kobokan village, Pronojiwo district, on Tuesday.
Willy Kurniawan/Reuters
A woman weeps after her home was destroyed by the eruption of Mount Semeru in Candi Puro village, Lumajang, East Java, Indonesia, on Tuesday.
A woman weeps after her home was destroyed by the eruption of Mount Semeru in Candi Puro village, Lumajang, East Java, Indonesia, on Tuesday.
Trisnadi/AP
Rescue volunteers carry a body bag in Curah Kobokan, Pronojiwo district.
Rescue volunteers carry a body bag in Curah Kobokan, Pronojiwo district.
Willy Kurniawan/Reuters
An aerial view of the village of Curah Kobokan.
An aerial view of the village of Curah Kobokan.
Willy Kurniawan/Reuters