Mount Agung on Indonesia’s resort island of Bali has erupted again, spewing a dense column of volcanic ash two kilometres into the sky and raising fears of disrupted air traffic.

The active volcano erupted at 3.21am on Sunday (local time) and the thick ash column was blown to the southwest, causing a drizzle of volcanic ash in Karangasem, Bangli and Klunglung districts, Sutopo Purwo Nugroho, a spokesman for the national disaster mitigation agency, said.

Previous eruptions have stopped air traffic and stranded tourists in the tropical paradise, but there has been no word of similar flying bans at this stage.

There were no immediate reports of casualties but the volcano’s status remains on alert or level three of four possible levels and authorities continue to impose a four-kilometre exclusion zone.

Two other volcanoes popular with tourists on the island of Java also continue to erupt.

Mount Bromo in East Java and Mount Merapi in Yogyakarta remain on standby, with exclusion zones also place.

“This a normal situation of an active volcano and there is no need for the public to panic, as long as they remain outside the danger zone,” Nugroho said.

“Don’t try to get closer to the crater to document the volcanic activity in the crater.”

Foreign climbers have tried to ignore the danger zone status and attempted to climb Mount Agung, causing rescuers to scour the mountain in a bid to evacuate them.

-with AAP