Scientists in Iceland have raised the threat level for the Grimsvotn volcano, warning there are now multiple indications that an eruption could soon take place.
This volcano experienced an unusually powerful eruption in 2011, firing a 20km pillar of ash into the air, but was overshadowed by the smaller eruption of the Eyjafjallajokull volcano the previous year, which forced the cancellation of some 100,000 flights in an unprecedented disruption.
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