Scientists are again investigating a volcano in Iceland after a number of depressions were found on its surface.
It is thought the sinkholes, measuring up to one kilometre wide, may have been caused by a sub-glacial eruption.
Increased seismic activity in the area has prompted fears of a looming eruption which could emit plumes of ash.
The last such incident in 2010 led to the grounding of flights across Europe.
Get a different perspective
Every story can be told in many ways: see the perspectives from Euronews journalists in our other language teams.