The volcano ejected a plume of gas and ash, sand and some rock up to 500 m (1 640 feet) from the crater. The column drifted to the east, south and southwest.
INETER said fragments of ejected rock fell near the crater while the sandy material reached distances of up to 1 km (0.6 miles).
The volcano is now emitting gasses, but they do not represent a danger for the population.
The agency said that new explosions are likely to occur during the day.