Experts are on high alert after a huge volcano came a step closer to erupting.
The risk of an eruption on Bardarbunga, which is Iceland's biggest volcano, has been moved up to level four - the second highest grade on the scale after officials recorded intense seismic activity at site.
In 2010, a giant ash cloud caused travel chaos, when Eyjafjallajokull volcano violently erupted.
Huge stretches of European airspace were shut - ruining the travel plans of over 10million passengers.
Officials warned there are strong indications of magma movement in the volcano, although there have been no indications that it could erupt.
Met Office seismologist Mr Martin Hensch said an ash cloud similar to the one in 2010 would depend on the size of the eruption.
He told RTE: "Presently there are no signs of eruption, but it cannot be excluded that the current activity will result in an explosive glacial eruption, leading to an outburst flood and ash emission."