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Small volcanic eruption in Iceland, but no ash yet

REYKJAVIK, Iceland -- Iceland authorities say there's been a small fissure eruption near Bardarbunga volcano, but no volcanic ash has been detected by the radar system.

The eruption took place early Friday morning in the Holuhraun lava field, north of Dyngjujökull glacier, Iceland's Meteorological Office said.

It says the aviation alert code has been changed to red, the highest level, but any ash produced has so far been minimal and all airports in Iceland are open. Icelandic Air Traffic Control has closed down the airspace from the ground up to 18,000 feet.

Volcanoes: Nature's ticking time bombs 12:18

The red warning indicates that an eruption is imminent or underway, with a risk of ash, the Reuters news agency explains.

In 2010, Iceland's Eyjafjallajokul volcano erupted and sparked a week of international aviation chaos, with thousands of flights canceled. Aviation officials closed Europe's air space for five days, fearing that volcanic ash could harm jet engines.

The eruption occurred in a lava field that's not covered by ice, Reuters notes, adding that the risk of an ash cloud is highest when eruptions happen in lava fields beneath glaciers.

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