The Philippine Institute of Volcanology and Seismology said the incident occurred before nightfall on Saturday when accumulated lava on the volcano’s southwestern slope gave way, sending an avalanche of hot rocks, ash and gas downslope.

The agency’s director, Teresito Bacolcol, said the volcano has been exhibiting mild eruptive activity intermittently since January but emphasized that no explosive eruption had taken place.Authorities reported no casualties, though ash clouds spread across 87 villages in three towns, reducing visibility to near zero in some areas and disrupting road movement.

Caloy Baldo, mayor of Camalig, said residents were caught off guard by the density of the ashfall, which he described as severe enough to halt traffic along national roads.Local officials said agricultural losses were reported, particularly in vegetable farms, while livestock deaths included four water buffaloes and one cow.

Cleanup operations were underway in affected communities, including Camalig, which has a population of about 8,000 people.The volcano, rising 2,462 meters and known for its near-symmetrical cone, is among the Philippines’ most active and closely monitored.

Authorities had raised its alert status to Level 3 in January, indicating heightened unrest with potential for hazardous eruptions, including rockfalls and pyroclastic flows.Bacolcol said conditions had stabilized as of Monday but warned that the threat of further activity remained, noting that the volcano’s behavior continues to require close monitoring under the current alert level.