USGS Global Volcanism Program
According to news articles, PHIVOLCS reported that on 11 December an explosion from Mayon was detected by the seismic network. On 14 December, At least five minor explosions were detected by the seismic network. Some local ashfall was reported. The Alert Level was raised to 3, prompting the order to evacuate about 50,000 people living within an 8-km radius from the base of the volcano.
Philippine Institute of Volcanology and Seismology
Mayon Volcano Bulletin
Government of the Philippines 2009/12/15
A total of 2,698 families/12,415 persons have been evacuated to the designated evacuation centers.
Reuters AlertNet 2009/12/14
Mayon volcano has been spewing lava and ashes that reached a height of about 100 metres (330 feet) on 14 December 2009.