A warning has been issued because the Etna and Stromboli volcanoes have become very active and dangerous. Travelers using Catania airport - one of the main international gateways to Sicily - faced severe delays today due to the latest eruption of Mount Etna. The active volcano, which is Europe's highest volcano, has seen a significant increase in activity over the past week. Stromboli, on the nearby Aeolian island, also erupted and spewed lava into the sea.