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Italy's Mount Etna triggered the country's highest aviation alert Thursday after an ash plume rose about 4 kilometers (2.5 miles) above the volcano, although flight operations at Catania's main airport continued without disruption.
The National Institute of Geophysics and Volcanology's Etna Observatory in Catania issued a red Volcano Observatory Notice for Aviation, or VONA, as ash coming out of the volcano's summit craters spread toward the south-southeast, according to Rai News.
A VONA is an aviation warning issued to inform aircraft operators about volcanic activity that could affect air travel.
The red alert was issued as Mount Etna continued to send ash into the atmosphere from its summit craters, with the plume reaching approximately 4 kilometers in height.
Despite the ash emissions, volcanic tremors, which indicate movement and activity beneath the volcano, remained at medium-low levels.
The volcanic activity had not disrupted operations at Catania's Vincenzo Bellini International Airport at the time of the report.
The airport remained operational even as the ash cloud moved toward the south-southeast from Mount Etna.
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