Indonesian officials have raised the alert for the Mount Sinabung volcano in North Sumatra to the highest level.
The status was raised from "stand-by" to "caution" - the highest alert for volcanic activity - on Sunday.
People have also been warned to stay at least 5km (3 miles) from the crater.
Mt Sinabung has been showing signs of life since September, after being dormant for three years. Over the weekend, it shot ash and rocks far into the air, prompting the alert move.
More than 15,000 villagers in the area had already been moved to temporary shelters, disaster management officials said in a statement.
Airlines have also been advised not to fly near the area.
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