Indonesia's Mount Agung volcano in Bali has let out a puff of black smoke and ash in a small eruption, prompting Singapore to advise its citizens to be ready to evacuate the holiday island at short notice amid concern about a bigger eruption.
"Right now this is not a serious eruption but of course this can change", Dr Krippner said. It last erupted in 1963, killing more than 1,000 people and razing several villages.
"In recent months, Indonesia's National Disaster Mitigation Agency has been warning residents and tourists to stay away from an exclusion zone of 7.5km around the crater on Bali", the ministry said.
Flights are continuing to and from Bali as Mount Agung finally begins to erupt.
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The rise in volcanic activity in the months prior to the eruption prompted around 140,000 people to relocate to safer locations.
Meanwhile, airlines are keeping a close eye on possible flight cancellations, but the airport remains open with no changes so far.
On Oct 29, the centre lowered the volcano's alert level by one notch after it had previously appeared to be on the brink of eruption.
Indonesia is home to about 130 volcanoes because it is located in the highly seismic area known as the "Pacific Ring of Fire".
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There is now an evacuation zone around the volcano, which stretches between six to 7.5km from the summit.
"Yesterday there was smoke and steam as high as 700 meters, and last night there were tremors for quite a while-around three hours", Kasbani, who like many Indonesians goes by one name, told Agence France-Presse on Wednesday.
The agency's spokesman has urged residents to remain calm.
The number of evacuees dropped to about 30,000 after the alert level was lowered.
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