The ashes expanded into a mushroom-shaped ash cloud that could be seen from the cities located 90 km to 150 km from the mountain.
There were no casualties reported.
Residents were warned to be vigilant about heavy rainfall triggering lava flows in rivers originating from the volcano An eruption of Mount Lewotobi Laki Laki in November killed nine people and injured dozens.
The 1,584-metre (5,197-foot) mountain is a twin volcano with Mount Lewotobi Perempuan in the district of Flores Timur.
Indonesia is an archipelago of 270 million people with frequent seismic activity. It has 120 active volcanoes and sits along the “Ring of Fire,” a horseshoe-shaped series of seismic fault lines encircling the Pacific Basin. (AP) SCY SCY