Mount Etna blasted a massive 12-km high (7.5-mile) pillar of volcanic ash into the sky over the Italian island of Sicily on Monday.
Scientists from Italy's National Institute of Geophysics and Volcanology (INGV) in Catania say activity centered on a lava flow on the mountain's southeast slope.
Ash from the eruption blanketed nearby towns according to Italy's civil protection agency but there have been no immediate reports of injuries or property damage.
Earlier Monday, authorities issued a warning for aircraft in the area.
Vincenzo Bellini international airport in nearby Catania closed at lunchtime Monday due to the eruption, the airport tweeted. Limited air traffic has since resumed but will be "restricted until the end of the #Etna emergency," the tweet said.