Long-dormant Icelandic volcanoes are waking up and threatening to erupt.  

The country declared a state of emergency and evacuated thousands from the southwestern town of Grindavik.  

There are more than 30 active volcano sites in Iceland and there's currently a 15-kilometre river of magma underneath the surface.  

UK correspondent Gavin Grey told Kate Hawkesby the likely eruptions follow intense seismic activity. 

“20,000 tremors have been recorded in southwest Iceland since late October.”

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