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Flights to and within the Mediterranean are being disrupted by an eruption of Mount Etna in Sicily.
Eurocontrol in Brussels says: "An eruption of volcano Etna has started. The height of the plume at the moment is up to FL140 [14,000 feet] and seems to be composed mainly by steam.
"Code is red."
Air traffic in and out of Catania airport, which is just south of the volcano, is reduced due to the risk of volcanic ash.
"Aircraft operators are strongly recommended to closely monitor all relevant Notams [notices to air men]," says Eurocontrol.
Some departures are running more than three hours late.
The easyJet flights from Catania to Bristol, Luton and Manchester are all delayed by over an hour.
The Volcanic Ash Advisory Centre in Toulouse (VAAC) said: "Some ash emission ongoing.
"Ash remains in the vicinity of the volcano below fl150 [15,000 feet]."
EasyJet told passengers: "Your plane was delayed on an earlier flight it operated due to air traffic control restrictions caused by activity to Mount Etna.
"We're working to minimise this delay where possible.The disruption is beyond our control and is considered an extraordinary circumstance."
Pictures: Earth from space: Spectacular volcanic eruptions seen from above (Espresso)