The authorities have raised the alert status to the second highest following the increase of seismic activities on the mountain over the recent weeks, he added.
The Mount Sinabung volcano erupted Oct 24, sending a column of smoke up to 3,000 meters.
The Mount Sinabung volcano is among 129 active volcanoes in the vast archipelago country, which is vulnerable to seismic upheaval as it lays on the Pacific "Ring of Fire".
