Indonesia's Mount Ibu erupted on Monday morning, sending thick columns of grey ash several kilometers into the sky, according to the country's volcanology agency. The volcano, located on the remote island of Halmahera, erupted at 9:12 a.m. local time (0012 GMT) for about five minutes, with ash reaching as high as 5 km (3.1 miles), officials said.
A smaller eruption was also recorded on Friday.
The volcano's alert status remains at the second-highest level, said Hendra Gunawan, head of Indonesia's Volcanology and Geological Hazard Mitigation Centre. All activities within a five-kilometer radius of the volcano have been prohibited.
"If it starts to rain ash, we recommend people near the volcano to wear a mask and glasses," Hendra said.
Footage of the eruption shared by the center showed clouds of grey ash billowing from the crater, accompanied by a booming noise.
No evacuations of residents have been reported so far.
Indonesia, located on the Pacific "Ring of Fire," has 127 active volcanoes, according to the volcanology agency.
In recent weeks, North Sulawesi's Ruang volcano has erupted, spewing incandescent lava as lightning flashed from its crater. The eruption prompted authorities to evacuate more than 12,000 people living on a nearby island.
In December, more than 20 people were killed after Sumatra's Mount Marapi, one of the most active volcanoes in the region, erupted and released grey clouds of ash as high as 3 km.