"The United States government on Tuesday advised its citizens to stay away from Mayon Volcano in Albay province after state volcanologists placed it under Alert Level 3.
In a warden message, the US Embassy said the Philippine Institute of Volcanology and Seismology (Phivolcs) has already warned of increasing volcanic activity.
"This alert condition signifies magma is near the top of the crater and incandescent materials are now detaching. Mayon volcano is now at a 'high level of unrest' and may have more dangerous explosions," it said.
It also noted that Phivolcs had recommended that the provincial government evacuate areas under threat.
Local governments have ordered evacuations in an 8-kilometer zone, it added. At least 12,000
residents were affected. Authorities moved thousands of villagers from harm's way near the Philippines' most active volcano Tuesday after it oozed lava and shot plumes of ash, and said they probably will spend a bleak Christmas in an evacuation center.
State volcanologists raised the alert level on the cone-shaped, 8,070-foot (2,460-meter) Mayon volcano overnight to two steps below eruption after ash explosions and dark orange lava fragments glowing in the dark trickled down the mountain slope. "
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