Indonesia's national volcanology centre said in a statement on Sunday night that the mountain's "seismic energy is increasing and has the potential to erupt", the BBC reported.
Popular tourist areas Kuta and Seminyak are about 70 kilometres away from the volcano, Mount Agung.
While flights in and out of Bali are operating normally and no volcanic ash has been detected, the island’s local tourism board advised visitors to "start preparing sufficient stock of face masks" in case of an eruption.
Several countries including Australia, Singapore and Britain have issued travel advisories warning of possible flight disruptions and evacuations.
In related news, Human Rights Watch Indonesian researcher Andreas Harsono has told Newscorp that a recent petition intended to target same-sex relationships in Indonesia could have a huge impact on Australian tourists to the island.
The petition calls for the criminalisation of sex outside of marriage as well as same-sex relations and has been put before Indonesia’s Constitutional Court this year.
Should the petition become law, unmarried and/or LGBTQI Australian tourists to Bali could find themselves committing a crime or causing offence should they engage in sexual relations.
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