"We have raised the status to 'caution', which is the highest of levels for volcanic activity because we anticipate there will be more eruptions and because the intensity of eruptions has been increasing," the National Disaster Mitigation Agency said in a statement.

Sinabung is one of nearly 130 active volcanoes in the world's fourth-most populated country, which straddles the "Pacific Ring of Fire", an arc of volcanoes and fault lines encircling the Pacific Basin.

The 2,600-meter Mount Sinabung has sporadically erupted since September. An eruption in 2010 killed two people and caught scientists off guard because the volcano had been quiet for four centuries.

About the broadcaster:

Anne Ruisi is an editor at China Daily online with more than 30 years of experience as a newspaper editor and reporter. She has worked at newspapers in the U.S., including The Birmingham News in Alabama and City Newspaper of Rochester, N.Y.

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