More:The risk of an eruption at Iceland's Bardarbunga volcano has increased, with signs of "ongoing magma movement", Iceland's meteorological office says.
The risk level to the aviation industry has been raised to orange, the second-highest level, the met office said.
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The Eyjafjallajokull volcano erupted in 2010, producing an ash cloud that severely disrupted European airspace.
BBC News - Iceland raises Bardarbunga volcano alert to orange
(During the 2010 eruption a new word was coined in Norway: "askefast" - it means being stuck somewhere due to volcano ash. A friend of mine got stuck in Paris, but got together with other askefaste Norwegians and hired a taxi(!) to take them to Oslo.)