REYKJAVIK, Iceland -- A volcano that's starting to erupt in Iceland has prompted authorities to raise the country's aviation alert to its highest level.
Iceland raised the alert level to red, indicating an eruption that could cause "significant emission of ash into the atmosphere." But no ash or steam has been detected yet
Authorities declared a no-fly zone of 100 nautical miles by 140 nautical miles around the eruption as a precaution, but did not shut the country's airspace.
The eruption has been detected under a glacier in a remote part of Iceland. Scientists flew over the ice cap today and saw no sign of the eruption on the surface of the glacier.
A volcanic eruption in Iceland in 2010 produced an ash cloud that caused a week of international aviation chaos, with more than 100,000 flights canceled.