Dramatic moment Italy's Mount Etna shoots up thick plumes of volcanic ash triggering aviation warning 

This is the moment thick plumes of volcanic ash billowed into the sky above Mount Etna on Saturday, as Italy's most active volcano triggered the highest aviation warning level.Explosive activity at Etna's summit craters intensified, producing continuous ash emissions. The change prompted scientists to issue a red Volcano Observatory Notice for Aviation (VONA), signalling a potential risk for aircraft.Rising more than 3,300 metres above sea level, Etna dominates eastern Sicily and is monitored around the clock due its frequent eruption.