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Jetstar has cancelled all flights in and out of Bali due to the ash cloud around the Mount Agung volcano.
The decision on Monday was made on safety grounds and overturns earlier expectations that flights would go ahead.
"While these disruptions are frustrating, we will always put safety before schedule," the carrier said in a statement.
Virgin Australia is expected to follow suit and will release an update shortly.
The Monday cancellations come after dozens of flights to and from Bali were scrapped on Sunday after ash from the volcano covered roads, cars and buildings.
Jetstar will next update passengers around 7pm (AEDT) upon the receipt of further advice from the Bureau of Meteorology's Volcanic Ash Advisory Centre.
Volcanic ash poses a potentially deadly threat to aircraft and passengers.
Indonesia's Volcano Observatory Notice for Aviation (VONA) has raised its aviation colour code from orange to red, indicating a further eruption with significant emission of volcanic ash into the atmosphere is imminent.
Mt Agung sits more than 3000 metres high over eastern Bali.
It last erupted in 1963, killing more than 1000 people and razing several villages.
Indonesia's disaster mitigation agency said it had raised the alert to the highest level four on Bali's Mount Agung volcano and warned residents in a 8-10km radius around the volcano to evacuate immediately.
"Grey ash and occasional weak blasts can be heard 12 km from the peak. Flames were visible at night which indicates a potential eruption could happen anytime," Indonesia's disaster mitigation agency said in a statement.
- AAP/ Reuters