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Fountains of glowing lava continued to burst through the crater from Mayon Volcano early Tuesday. Volcanologists earlier said the volcano could be on the verge of a violent eruption.

The Philippine Institute of Volcanology and Seismology had already declared alert level 4 on Mayon Volcano on Monday afternoon following an increase in seismic unrest, lava fountaining, and summit explosions.

Mayon Volcano started to spew lava past 9 p.m. on Monday that reached from 500 to 700 meters, based on time-series photos taken at the Mayon Volcano Observatory, Lignon Hill, Legazpi City in Albay province.

Another lava fountain was photographed by Phivolcs past 1 a.m. on Tuesday.

In a live report over Umagang Kay Ganda, Mayon Volcano continued to spew lava until 5 a.m.

Some 40,000 residents in Albay province have already been evacuated following fresh activity from the restive volcano.

• READ: 40,000 flee Mayon eruption

Renowned for its near-perfect cone, Mayon Volcano is the most active among the volcanoes in the Philippines.

Its most destructive eruption was in Feb. 1841 that buried a town and killed 1,200 people, records from Phivolcs showed.