PADANG, Indonesia (AP) — At least 11 hikers were found dead and three others rescued by search parties who searched through the night to find missing people after a volcano erupted in western Indonesia, officials said Monday.

Mount Marapi on the island of Sumatra, with a peak of 2,891 meters, erupted on Sunday, spewing a 3,000-meter-high tower of ash into the sky, raining volcanic debris on surrounding villages.

Local and national officials estimated the number of hikers on the mountain at 75 over the weekend, but search teams found the 11 dead near the crater on Monday morning.

“There are 26 people who were not evacuated, we found 14 of them, three were found alive and 11 dead,” said Abdul Malik, head of the Padang Search and Rescue Agency, a day after the eruption.

Twelve were still missing and 49 had descended the mountain, with some taken to hospital, he said.

The three survivors were found near the crater and “their condition was poor and some had burns,” the official said.

Because of the difficult terrain, rescue workers took turns carrying the dead down the mountain.

A clip shared with AFP by rescue teams on the scene showed an ambulance blaring its sirens and rescuing an evacuated climber with burns from the scene.

In another clip, a rescue worker with a flashlight strapped to his head piggybacks a hiker who moans in pain and says “God is great” as she is carried to safety in the darkness of the night.

The eruption was ongoing, preventing a helicopter evacuation, Malik said.

“Visually, smoke is still rising from above until this morning. Visually everything still looks gray,” he said.

It’s raining ash

Rudy Rinaldi, head of the West Sumatra Disaster Mitigation Agency, told AFP that some of the rescued hikers required medical treatment due to their proximity to the eruption.

“Some suffered burns because it was very hot and were taken to hospital,” he said.

“Those who got closer to the crater were injured.”

According to the national search and rescue agency Basarnas and the list of those found seen by AFP, at least eight people suffered burns, one had burns and a fracture and another had a head wound.

Ahmad Rifandi, an official at the Mount Marapi monitoring station, told AFP that ashfall was observed following the eruption.

“It has reached the city of Bukittinggi,” he said on Sunday, referring to the third-largest city in West Sumatra with more than 100,000 residents.

Ade Setiawan, an official with the local disaster management agency, said in a statement that residents of surrounding villages “were given masks and reminded to stay in their homes.”

Marapi is in the second alert level of Indonesia’s four-level system and authorities have imposed a three-kilometer exclusion zone around its crater.

The Indonesian archipelago lies on the Pacific Ring of Fire, where the meeting of continental plates leads to high levels of volcanic and seismic activity.

The Southeast Asian country has almost 130 active volcanoes.