Etna, Europe's most active volcano, erupted on Sunday and spewed ash at Catania, the largest city in eastern Sicily, suspending flights at the city's airport.
Italy's National Institute of Geophysics and Volcanology (INGV), which closely monitors Etna, said clouds and rainy days hampered monitoring of the eruption, which is once a spectacular display of fire and lava.
The institute said ash fell on Catania and a town on the slopes of Mount Etna. There were no reports of injuries.
Catania Airport announced that flights were temporarily suspended due to the ash.
INGV indicated that monitoring recorded evidence of increased tremor activity in recent days.
Italy's national civil protection agency said in a warning on Thursday that, given the increased volcanic activity, there could be "sudden" variations in Etna's activity.
At the beginning of 2021, the eruption of the volcano lasted for several weeks.
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