A rumbling volcano in western Indonesia has unleashed an avalanche of scorching clouds down its slopes.
Authorities are closely monitoring Mount Sinabung on Sumatra, one of Indonesia's main islands, after sensors picked up increasing activity in past weeks.
The volcano in North Sumatra province was shooting smoke and ash more than 1000 metres into the air on Sunday morning, and hot ash clouds travelled one kilometre southeast, Indonesia's Volcanology and Geological Hazard Mitigation Center said.
Villagers were advised to stay 5km from the crater's mouth and should be aware of the peril of lava, the agency said. Air travel was not impacted by the ash so far, the Transport Ministry said.
Sinabung volcano is seen spewing giant hot clouds into the air as eruptive activity. Source: ABACA
There were no casualties from the eruption, said Armen Putra, an official at the Sinabung monitoring post. He said villages outside the red zone were not in immediate danger.
Some 30,000 people have been forced to leave homes around Sinabung in the past few years.
The 2600m Sinabung was dormant for four centuries before exploding in 2010, killing two people. Another eruption in 2014 killed 17 people, while seven died in a 2016 eruption.
The volcano, one of two currently erupting in Indonesia, has sporadically come to life since then.
Sinabung is among more than 120 active volcanoes in Indonesia, which is prone to seismic upheaval due to its location on the Pacific "Ring of Fire", an arc of volcanoes and fault lines encircling the Pacific Basin.
