Mount Ipo, in eastern Indonesia, which has been very active since the beginning of the year, erupted again on Friday, sending a column of ash 7 km (4.4 miles) above the summit, authorities said.
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No damage or injuries were immediately reported after the two explosions, which occurred within one hour. The first incident occurred at 10:45 am local time (1:45 am GMT).
The National Center for Volcanology and Geological Risk Management released an image of the thick plume of gray ash dominating the white clouds around the volcano on Halmahera Island in the North Moluccas province.
Residents have been urged not to enter a 5-kilometre restricted zone around the crater, the Volcanology Center said in a press release.
After erupting 100 times since the start of the year, the volcano was downgraded last week to alert level 2 on a scale of four.
Mount Ebo is one of the most active volcanoes in Indonesia, with more than 21,000 eruptions recorded last year.
According to official figures for 2022, more than 700,000 people live on Halmahera Island.
Indonesia, a vast archipelago, experiences frequent seismic and volcanic activity due to its location on the Pacific Ring of Fire.
In April, the Ruang volcano in North Sulawesi province erupted more than six times, forcing thousands of residents on neighboring islands to evacuate.