LUMAJANG, INDONESIA: Indonesia's Mount Semeru erupted Sunday spewing hot ash clouds a mile into the sky and sending rivers of lava down its side, prompting authorities to raise the alert status to the highest level.
The eruption of the highest mountain on Indonesia's main island of Java, around 800 kilometres (500 miles) southeast of the capital, Jakarta, sparked evacuations of nearby villages exactly one year after its last major eruption killed dozens of people.
The increased threat level "means the danger has threatened the people's settlement and the volcano's activity has escalated", Volcanology and Geological Disaster Mitigation Center (PVMBG) spokesperson Hendra Gunawan told broadcaster Kompas TV.
"Hot avalanches" caused by piles of lava at the tip of the 3,676-metre (12,000 feet) volcano slid down after the eruption, National Disaster Mitigation Agency spokesperson Abdul Muhari said in a statement.
No casualties or injuries were reported immediately after the eruption but Gunawan warned nearby residents not to travel within eight kilometres (five miles) of the crater after the threat level was raised to four.
Shelters were being prepared for nearby residents who were evacuating, Gunawan said.
Images on local TV showed evacuees, mostly women and children, taking shelter in a school.
Videos shared with AFP by local rescue group Irannala Rescue showed a huge black cloud rising from the volcano's crater, engulfing the sky and blocking the sun in nearby villages.
The villages were being battered by monsoon rains by the afternoon and the rainfall was mixing with volcanic ash, according to Kompas.
Residents were also told to avoid a southeastern area 13 kilometres (8 miles) along a river in the direction where the ash was travelling.
"A lot of people have started to go down," Thoriqul Haq, the local administration chief for Lumajang, where the volcano is located, told Kompas TV.
Most residents in the two most-threatened villages have evacuated themselves, said Patria Dwi Hastiadi, spokesperson of the Lumajang Disaster Mitigation Agency.
Japan's weather agency had earlier warned that a tsunami was possible in the southern islands of Miyako and Yaeyama in Okinawa prefecture, Kyodo news agency reported, but there were no reports of damage an hour after its projected arrival.
The internet was cut and phone signals were patchy after the eruption, according to an AFP journalist.
The local rescue agency distributed free masks to the public because of the threat of polluted air to vulnerable residents.
Mount Semeru last erupted exactly one year ago, killing at least 51 people and damaging more than 5,000 homes.
The disaster left entire streets filled with mud and ash that swallowed houses and vehicles, with nearly 10,000 people seeking refuge.
A bridge that connects two districts in the area that was being rebuilt after last year's eruption was heavily damaged again on Sunday, according to a PVMBG media officer.
Semeru's alert status had remained at its second-highest level since its previous major eruption in December 2020, which also forced thousands to flee and left villages covered.
Indonesia sits on the Pacific Ring of Fire, where the meeting of continental plates causes high volcanic and seismic activity.
The Southeast Asian archipelago nation has nearly 130 active volcanoes.
A volcano in the strait between Java and Sumatra islands erupted in late 2018, causing an underwater landslide and tsunami that killed more than 400 people.
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