(CNN)A volcano eruption in Alaska sent ash 20,000 feet up in the air and prompted flight warnings, according to authorities.

Recently active volcanoes
22 photos: Recently active volcanoes

The Pavlof Volcano, located on the Aleutian Islands, began "erupting abruptly" Sunday afternoon, according to the Alaska Volcano Observatory. 

A volcano alert warning remained in effect early Monday morning, and the aviation warning color code remains red, its highest level.

Seismic activity was also reported after the quake.

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