Iceland has shut its main airport after a volcanic eruption.
Other airports on the island are likely to close during the day, the civil aviation authority has said.
The closure of Keflavik International Airport comes after Iceland's most active volcano, Grimsvotn, started erupting yesterday for the first time since 2004.
Europe's air traffic control organisation has said it expected no impact on European or transatlantic flights for at least 24 hours.
Eurocontrol said it was monitoring the situation as a plume of ash from the Grimsvotn volcano drifted towards the northeast.
The volcano has thrown a plume of white smoke about 20km into the air, but officials say the ash is heavy and unlikely to be dispersed over a wide area.
Grimsvotn lies under the Vatnajokull glacier in southeast Iceland, the largest glacier in Europe.
'The ash distribution forecast over the next six hours shows that the ash from the volcano will spread over Iceland today', the Isavia authority said in a statement.
The website of newspaper Morgunbladid said the eruption was more powerful than its last in 2004.
Aviation officials are closely monitoring the situation after another volcano shut European airspace for days last year.
When Grimsvotn last erupted in 2004, transatlantic flights had to be re-routed south of Iceland, but no airports were closed.
Iceland's Eyjafjallajokull caused chaos when it erupted in April last year.
Authorities halted flights due to fears that dust and ash would get into aircraft engines and cause accidents after the cloud was blown into European air traffic lanes.
Airlines have been warned that ash could reach northern Scotland by Tuesday and parts of Britain, France and Spain by Thursday or Friday if the eruption continues at the same rate.
Met Éireann have said that, in the short-term anyway, Ireland will not be affected by the eruption of the Icelandic volcano.
Met Éireann is monitoring the situation and at the moment weather conditions are favourable for Ireland.
While wind direction could change in the coming days, any volcanic ash is currently being swept northwards.
