Italy's Mount Etna on the island of Sicily erupted Monday, spewing ash and hot lava that sent tourists fleeing from the 10,925-foot mountain, which is one of the world's most active volcanoes.

Italy's Mount Etna erupted early Monday, causing tourists to flee as it spewed a massive plume of hot volcanic debris into the air. Videos circulating on social media purportedly show people on guided tours running from the eruption.