Airlines have issued a shock “red warning” about the impending danger of volcanic ash in the skies over Bali, following the second emission from Mount Agung this week.
Emergency authorities have handed out eerie masks to local residents and tourists trapped on the island as fears grow about an imminent major eruption.
Last night, Mount Agung emitted a thick plume of smoke reaching 4,000m (13,100 feet), which has thrown airports into disarray and tourists into a panic.
The latest alert – a red warning – means an eruption is forecast to be “imminent” after nearby locals spotted volcanic ash rain.
In shock live footage, the distant volcano can be seen emitting thick ash in the video below while brave monitors look on across the forest.
Authorities have told people within a 7.5km exclusion zone to “immediately evacuate” in an “orderly and calm manner”.
Bali is a major tourist destination, and major airlines have already cancelled flights to and from the island amid fears of ash disrupting plane engines.
On the island of Lombok, the main international airport has been closed entirely.
About 25,000 people are thought to be in shelters while more than 140,000 people fled earlier this year.
According to official estimates, the holiday island has already lost at least £83m in tourism and productivity due to the major evacuation.
Indonesia sits on the Pacific Ring of Fire where tectonic plates collide, causing frequent seismic and volcanic activity.
The last time Mount Agung erupted, in 1963, more than 1,000 people died.