A spokesperson with the disaster agency told the Jakarta Globe the ash cloud is 13,000 feet above the ground and moving eastward at 11 miles per hour.
No seismic activity has accompanied the eruptions, and Indonesian officials have said the island remains safe outside of a 4.7-mile danger zone surrounding Mount Agung.
However, he said some airlines chose to cancel flights between Bali and Australia following the latest volcanic activity. Virgin and Dutch airline KLM are also reported to have cancelled flights.
Authorities warned anyone still in the exclusion zone around the volcano, which extends 7.5 kilometres (4.5 miles) from the crater in places, to leave. Chances are that the eruption intensifies in the coming days, but just how much and how long it will last, and how risky it might become, is impossible to say at the moment.
According to the BBC, increased volcanic activity this year sparked fears of an imminent full-scale eruption involving magma flows, costing "at least $110m in tourism and productivity during the major evacuation".
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Several thousand people were affected by Saturday's flight cancellations. "Three flights that were en route to Bali have returned to Australia".
Most recently, the 3,142-metre volcano spewed grey smoke and ash as high as 700 metres Tuesday, and again Saturday to twice that height, before beginning to emit lava Sunday.
"We raised the status to red [the highest warning level] as volcanic ash clouds had reached an altitude of more than six kilometers above sea level", said Kasbani, the head of PVMBG, on Sunday as quoted by Antara news agency.
Indonesia sits on the "Pacific Ring of Fire" and has more than 120 active volcanoes.
When the volcano last erupted in 1963, it killed more than 1,000 people and destroyed several villages, remaining one of the largest and most devastating eruptions in the Southeast Asian country's history.