Italy's Mount Etna, Europe's tallest volcano, erupted Monday, sending ash and rock into the air. We show you where.

Mount Etna, the tallest and most active volcano in Europe, erupted on Monday on the Italian island of Sicily. Dramatic video footage shared on social media showed tourists fleeing down the side of the mountain as a thick volcanic cloud intensified above them.

Mount Etna, one of Europe’s largest and most active volcanoes, erupted on the Italian island of Sicily on Monday, sending a massive plume of ash and smoke billowing into the sky. Several videos of tourists running for their lives down the side of the mountain have surfaced online.