Children play in a river before a backdrop of the Mayon volcano. Three steam-explosions since Saturday have spewed ash into nearby villages and may have caused lava to start to flow out. Photograph: Charism Sayat/AFP/Getty Images


Thousands of villagers evacuated after authorities warn ‘hazardous eruption’ is possible within weeks or even days...

The Philippines’ most active volcano has rumbled back to life with lava fragments rising to its crater in a gentle eruption that has prompted authorities to evacuate thousands of villagers.

Authorities raised the alert level at the Mayon volcano to “level 3” on Sunday after detecting lava flow and indications of activity that could lead to eruptions of magma.

The Philippine Institute of Volcanology and Seismology (Phivolcs) warned late on Sunday that a “hazardous eruption” of Mount Mayon was possible within weeks or even days. The 2,460-metre (8,070-ft) volcano is located in Albay province in the north-eastern Philippines.

Renato Solidum, from the institute, said three steam-explosions by the volcano since Saturday have spewed ash into nearby villages and may have breached solidified lava at the crater and caused lava to start to flow out.

Disaster response officials said nearly 1,000 families had been moved to emergency shelters.

Authorities advised people to cover their mouths and noses with a damp, clean cloth or dust mask if they were exposed to ash from the eruptions, and said aircraft must avoid flying close to the volcano’s summit.

Two similar “phreatic” eruptions occurred at the volcano in central Albay province on Sunday, unleashing more ash.

“Mayon’s summit crater is now exhibiting bright crater glow that signifies the growth of a new lava dome and beginnings of lava flow towards the southern slopes,” the Philippine Institute of Volcanology and Seismology (Phivolcs) said.

Solidum said the volcano appeared due for another major eruption as it has been displaying abnormal behaviour since late last year.

“Alert level 3 is what we considered critical, 4 is when eruption is imminent, and 5 is eruption in progress,” Cedric Daep, the head of the Albay Provincial Disaster Risk Reduction and Management Office, said in a radio interview.

Mayon’s most destructive eruption was in February 1814, when lava buried a town and killed 1,200 people. It last erupted in 2014, spewing lava and forcing thousands of people to evacuate.

The latest eruptions began on Saturday, unleashing ash, rocks and sulphur fumes and accompanied by rumbling sounds.

Phivolcs had earlier raised the alert to level 2, saying the activity was “probably of magmatic origin, which could lead to more phreatic eruptions or eventually to hazardous magmatic eruptions.”

Since Saturday’s first eruption, Phivolcs said it had recorded 158 rockfall events and urged people to stay away from a 6km (3.7-mile) radius permanent danger `one and a 7km Expanded Danger Zone on the volcano’s southern flank.

Landslides and sudden explosions or a dome collapse that may generate hazardous volcanic flows are also possible, it said.

People within the slope of the volcano, but outside the danger zones, were told to take precautionary measures against possible roof collapses due to accumulated ash and rainwater, and “lahar”, an Indonesian term for a volcanic mudflow.

And the provincial government suspended Monday’s classes from kindergarten to senior high school in some areas.

This article was amended on 15 January 2018. Mayon’s most destructive eruption was in 1814, not 1841 as an earlier version said.

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David Pike, Editor