Mount Kanlaon, located in the central island of Negros, launched a plume of whitish-grey ash about 1.5km into the air, said Kenn John Veracruz of the official Philippine Institute of Volcanology and Seismology.
The civil aviation office issued an advisory, saying "flights operating in the vicinity of the volcano are advised to avoid flying close to the summit as airborne ash from a sudden eruption can be hazardous to aircraft".
The volcano, located about 510km south of Manila, has been more active than usual since November, prompting the government to ban hikers from its slopes.
Mr Veracruz said that so far the authorities had not detected any lava rising inside the 2.47km-high volcano, but they were checking how far the ash was being scattered by the wind and whether it could affect nearby communities.
http://www.straitstimes.com/asia/se-asia/volcano-in-the-central-philippines-spouts-massive-ash-column-15km-into-the-air-prompts
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