The Bali volcano will erupt again according to experts and residents were told to evacuate the danger zone after a “red warning” was issued.
Mount Agung has erupted twice in the past week, but fears have grown that the next eruption could cause massive destruction to the surrounding area of the volcano.
The Bali volcano has already sent a massive ash cloud 4,000m (13,100 feet) into the sky after months of seismic activity.
After being warned to leave the area, resident’s claimed they were “afraid” of another huge eruption.
One resident told Channel 4 News: “We’re coming back here because we were so afraid when we saw the huge thick black smoke rising from the volcano yesterday.
“We who lived in the danger zone decided to leave”.
Indonesia’s National Disaster Mitigation Agency said 40,000 people had been evacuated from near Bali’s erupting Mount Agung volcano, but around 100,000 people needed to move.
The agency also said that Bali was “still safe” for tourists except for the 4.7-mile zone around Mount Agung.
Sutopo Yuwono, from the National Disaster Mitigation Agency, warned that the island should brace for another eruption as “explosions” have already begun.
He said: “The possibility of a large eruption is very high. Some indications show that there will indeed be an eruption.
“Since yesterday the eruption that happened has been accompanied by a sound of explosions and vibrations that can be heard and felt within a distance of 12km.”
The British Government has urged nationals in Bali to heed the advice of authorities as Mount Agung’s volcanic activity could “escalate” at any time.
“Ash clouds have caused airport closure for periods in both Bali and Lombok and disruption to flights in the region,” the Government’s travel advice webpage said.
The huge ash cloud has already led to the cancellation of hundreds of flights and left thousands of people stranded.
Professor David Rothery, a volcanologist at the Open University, has warned that gas trapped within Mount Agung could cause a huge explosion and pyroclastic flows if it cannot escape.
Speaking to Sky News, he said: “It’s a matter of whether that gas can escape passively, just by bubbling through the magma and cracks in the volcano.
“Or whether it builds up to such a volume of gas that it blows out explosively and drives a very high column of fragmented ash high into the sky.
“A big heavy column being driven upwards, that can then collapse down and produce these horrible pyroclastic flows which sweep across the terrain.”