MANILA, Jan 6 (Reuters) - The Philippines on Tuesday raised its alert level for the Mayon volcano in the central province of Albay, warning of "potential explosive activity" in the coming days or weeks and advising people to stay outside of a 6-kilometre (3.7 miles) danger zone.
The Philippine Institute of Volcanology and Seismology, also known as Phivolcs, raised the alert to level three on a five-level scale, which means magma is pushing up inside the volcano and forming a lava dome at the summit.
