Albay province emergency response official Cedric Daep said at least 9,000 people have been moved from high-risk areas in an ongoing evacuation.
Authorities upgraded the alert level at the Mayon volcano in the southern part of Luzon to "level 3" Sunday after observing steam eruptions and a bright lava glow.As many as 3,000 villagers fled their homes while the volcano spewed ash, CNN affiliate CNN Philippines.
The Philippines raised the alert level at its rumbling Mayon volcano to "level 3" on Sunday after detecting lava flow and indications of activity that could lead to eruptions of magma.
More than 12,000 people from a danger zone around Mayon volcano have been evacuated due to the volcano has been ejecting ash into the air since Saturday, Philippine authorities said on Monday.
The volcano of Mount Mayon has reportedly erupted 50 times in the last 500 years.
Local media reports said residents have also reported loud rumblings and a smell of sulphur emanating from the volcano.
Risky flows of lava down the crater of the Philippines' most active volcano have followed ash clouds and rock falls, prompting authorities to evacuate around 9,000 residents for their safety.
"Technically, Mayon has been erupting non-explosive magmatic eruption with lava flow being issued out of the summit crater", Philvolcs director Renato Solidum said as quoted by ABS-CBN News.More news: Katie Couric breaks silence on Matt Lauer: 'I had no idea'
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Three steam-explosions since Saturday have spewed ash into nearby villages and may have breached solidified lava at the crater and caused lava to start flowing, Solidum said.
Mayon's first recorded eruption was in 1616.
The air that smelt like sulfur after the ash fall was risky and people were advised to cover their noses and mouths with a mask or a damp clean cloth.
Due to thick clouds, the crater and ash column were not visible but Phivolcs confirmed the column of ash went in the southwest direction.
Mayon's most destructive eruption was in February 1841, when lava flows buried a town and killed 1,200 people.
State volcanologists recorded three lava collapses at the Mayon on Monday; they resulted in rockfall and three small-volume pyroclastic density currents, a fast-moving flow of hot gas and volcanic matter. In 2013, an ash eruption killed five climbers, including three Germans, who had ventured near the summit despite warnings of possible danger.
In an advisory, Bichara reiterated the evacuation of residents inside and within the periphery of the 6-km PDZ.