The Peruvian Geophysical Institute said the explosion may have been linked to recent seismic tremors measured in the area.
Sabancaya is Peru’s most active volcano and considered its most dangerous.
The mountain remained dormant for more than 200 years before roaring to life in late 1986.
The most sustained period of activity in modern times began in May 1990 and continued for more than eight years.
Photo: Instituto Geofísico del Perú