The eruption of Mount Agung on the island of Bali spewed ash 8,200ft into the air, grounding 276 flights in and out of Ngurah Rai airport.
People living in villages below have fled to evacuation centres.
“Micro tremors are still being detected… indicating that magma is moving towards the surface,” Sutopo Purwo Nugroho of the disaster mitigation agency said.
He said 309 residents living in a danger area 2.5 miles from the crater had voluntarily gone to three evacuation centres on Friday.
