Indonesia's Mount Semeru spewed more ash on Monday, hampering the search for survivors as the death toll rose to 22 following the volcano's deadly weekend eruption.

The biggest mountain on the island of Java thundered to life Saturday, ejecting a mushroom of volcanic ash high into the sky and raining hot mud as thousands of panicked people fled their homes.

Aerial photos showed entire streets filled with grey volcanic ash and mud, which had swallowed many homes and vehicles, including whole trucks.

Indonesia's national disaster agency said the number killed rose to 22 on Monday night and 27 people were still missing.

"I'm still hoping my son will be found... Every time I hear victims have been found, I hope it is my son," said Maskur Suhri of Sumberwuluh village, who was collecting palm tree sap when Semeru erupted.

"There's a very small chance he survived... Maybe it's my son's fate, but I still hope he will be found, even just his body."

Fresh volcanic activity on Monday hampered search efforts, forcing rescue teams to pull out from some areas.

"There was a small fresh eruption and it could endanger the evacuation teams," said rescue worker Rizal Purnama.

Dangerous thick plumes of smoke continued to emerge from areas blanketed by the volcanic ash, while rescuers in hardhats tried to dig through the mud to try and find survivors -- and recover bodies.

Their task was made more difficult as the volcanic debris had started to harden.

"It's very difficult... with simple tools," Rizal Purnama said. "It is very likely bodies that have not been found are buried under the hot mudflow."

Other rescuers helped desperate villagers salvage their belongings from wrecked homes. Some locals lifted mattresses and furniture on their shoulders while others carried goats in their arms.

- 'I could only pray' -

Officials have advised locals not to travel within five kilometres (3.1 miles) of Semeru's crater, as the nearby air is highly polluted and could affect vulnerable groups.

Ash from Semeru travelled up to four kilometres away after the Saturday eruption, Indonesia's geological agency reported.

A sand mine company's office in Kampung Renteng village was buried after the eruption, trapping 15 people, according to foreman Hasim, 65, who like many Indonesians goes by one name.

"There's no news from them. Only one operator was rescued, he's now at the hospital with burns," he told AFP.

Hasim said he ran home after the eruption.

"It was pitch dark," he added. "It was only 3 pm but it looked like night."

Rescue officials said some were buried inside their vehicles, with no time to escape.

Those who managed to find shelter recounted the horror after the eruption.

Suwarti Ningsi and her daughter were trapped for five hours at home after the eruption.

"I couldn't see anything, it was just like at night. Everybody was panicking," said the 42-year-old.

"I could only pray... for me and my daughter to be saved."

The Red Cross said it had rushed ambulances, medical teams, more than 65,000 surgical masks -- to protect against ash and Covid -- and other emergency supplies to the affected areas.

- Threat of rain -

The ash and mud have also polluted the waterways around Mt Semeru, turning them into streams of dark grey sludge.

Rain is forecast for the area, which could further hinder rescue work.

There is also a risk of the rain causing ash sediment to form a new river of hot lava, the country's top volcanologist Surono told a local TV station.

Semeru's last major eruption was in December 2020, which also forced thousands to flee and wrecked villages.

Indonesia sits on the Pacific Ring of Fire, where the meeting of continental plates causes high volcanic and seismic activity, and the country has nearly 130 active volcanoes.

In late 2018, an eruption in the strait between Java and Sumatra islands caused an underwater landslide and tsunami that killed more than 400 people.

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Residents in shadow of Indonesia volcano reckon with ruin
Lumajang, Indonesia (AFP) Dec 5, 2021
Surrounded by an apocalyptic scene of molten ash and mud, locals who live in the shadow of Indonesia's Mount Semeru combed through ruined belongings Sunday after their homes were blanketed by its eruption a day earlier. Fathers cradled distressed daughters, elderly villagers heaved mattresses on their backs and farmers carried goats that had survived, trying to salvage what they could from where their village once existed. "We did not know it was hot mud," said Bunadi, a resident of Kampung Rent ... read more