According to Geological Hazard Mitigation Center, there have been no fatalities or injuries due to the morning eruption.
Villagers are advised to stay 5 kilometers (3.1 miles) from the crater’s mouth and should be aware of the peril of lava, the agency said. Air travel was not being impacted so far by the ash, the Transport Ministry said.
Some 30,000 people have been forced to leave homes around Sinabung in the past few years.
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An area around the volcano has been barricaded off for years, but nearby communities were covered in thick ash Monday after the volcano sent a column of volcanic ash up to 16,400 feet into the sky.
Falling grit and ash accumulated up to 2 inches in already abandoned villages on the volcano's slopes, Armen Putra, an official at the Sinabung monitoring post on Sumatra Island, told the Associated Press.
Indonesia's Transport Ministry said that air travel was not being impacted so far by the ash.
The eruption had begun on Saturday after a year of inactivity. Last year the eruption had occurred on May 7 and then on June 9.
The volcano, one of two currently erupting in Indonesia, was dormant for four centuries before exploding in 2010, killing two people. Another eruption in 2014 killed 16 people, while seven died in a 2016 eruption.