Scientists are monitoring Iceland's Katla volcano amid signs that a small eruption may be taking place.
The acting head of the Civil Protection Agency Iris Marelsdottir, says flooding is taking place near the volcano, caused by the melting of its ice cap.
But she says the flooding may have other causes _ such as high geothermal heat _ so it not yet clear whether there is an eruption.
Katla typically awakens every 80 years or so, and last erupted in 1918.
Iceland, in the remote North Atlantic, is a volcanic hotspot. In April 2010 ash from an eruption of its Eyjafjallajokul volcano grounded flights across Europe for days, disrupting travel for 10 million people.
Katla sits beside Eyjafjallajokul.