The first eruption took place at 11:04 am local time (0304 GMT) and lasted nearly 11 minutes, according to a statement from the Indonesian volcanology agency.
The second was at 2:41 pm and lasted a little over 10 minutes, spewing volcanic material 900 metres above the crater.
"Residents and visitors around Mount Lewotobi Laki Laki are prohibited from conducting any activity within the three-kilometre radius from the centre of eruption," the agency said.
The mountain, located on the popular tourist destination of Flores island, had several major eruptions in January, prompting authorities at the time to raise the alert status to the highest level and evacuate at least 2,000 residents.
The volcano is currently at the second-highest alert level.
Indonesia, a vast archipelago nation, experiences frequent eruptions due to its position on the Pacific "Ring of Fire", an area of intense volcanic and seismic activity.
In December last year, an eruption at one of the country's most active volcanoes, Mount Marapi in West Sumatra, killed at least 24 climbers, most of them university students.
And in May, more than 60 people died after heavy rains washed volcanic material from Marapi into residential areas, sweeping away homes.
Indonesia's Mount Ibu erupts twice, belches tower of ash
Jakarta (AFP) June 28, 2024 -
A volcano in eastern Indonesia erupted twice on Friday, sending a hot cloud of ash as high as seven kilometres (4.3 miles) into the sky.
The country's Center for Volcanology and Geological Hazard Mitigation shared an image of the thick column of grey ash towering among white clouds around Mount Ibu, located on the island of Halmahera in North Maluku province.
No damage or casualties were immediately reported from the two eruptions, which took place within the span of an hour. The first occurred at 10:45 am (0145 GMT).
"The eruption is still ongoing at the time of this report," the volcanology centre said in a statement.
Locals were urged not to go within five kilometres of Ibu's crater, the statement added.
Mount Ibu is currently at the second-highest level of alert after the authorities lowered it last week.
Ibu is one of Indonesia's most active volcanoes, erupting more than 21,000 times last year.
More than 700,000 people lived on Halmahera island as of 2022, according to official figures.
Indonesia, a vast archipelago nation, experiences frequent seismic and volcanic activity due to its position on the Pacific "Ring of Fire".
Last month, Mount Ruang in North Sulawesi province erupted more than half a dozen times, forcing thousands of residents of nearby islands to evacuate.
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