Rescuers found a 29-year-old man in serious condition on the volcano’s eastern slope on Sunday. He was later pronounced dead at a hospital in Catania.

Ash spewing from Mount Etna on Sicily caused the cancellation of more than 700 flights during the peak of Italy’s summer tourism season.

Etna erupts often, but it usually doesn’t release this much ash, an expert said. Tens of thousands of travelers’ plans have been disrupted in the past week.