The Bulusan volcano spewed a huge cloud of ash for at least a kilometer on Sunday in the eastern Philippines.
The explosive eruption lasted about 17 minutes, according to the Philippine Institute of Volcanology and Seismology, and prompted evacuations in nearby towns.
Authorities have warned of possible new eruptions.
In response, the authorities raised the alert level to 1 out of 5, signaling "low intensity unrest".
"There was a phreatic eruption of the Bulusan volcano, which means that the explosion was caused by boiling water under the crater," Renato Solidum, the director of the institute, told local radio DZBB.
Significant ash fall following the eruption at Mount Bulusan Sorsogon Bicol Region.
Inhalation of ash particles is health threatening.
Potentially damaging to houses.
pic.twitter.com/vntrbM31CS
— GeoGeorge (@GeoGeorgeology) June 5, 2022
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Two cities covered in ashes
Ash hit two towns in Sorsogon, about 500 kilometers south of Manila, but no injuries were immediately reported, the institute said.
In Juban, the ashes caused “zero visibility” in two localities, and a fire truck intervened to clean the area, explained an official from the Office of Natural Disasters, Dennis Despabiladeras.
"The evacuation is underway there, and our priority is the elderly and people with asthma," he told AFP.
The Manila airport authority said no flights had been affected so far, although pilots had been warned not to approach the area of the eruption.
20 active volcanoes in the Philippines
Philippine authorities reminded residents of the ban on entering a four-kilometre radius around the volcano, and advised people living nearby to be cautious "due to increased possibilities of sudden and dangerous groundwater eruptions".
Residents near valleys and rivers were also told to be alert to mudslides in the event of heavy rain.
Blast from Bulusan volcano in the Philippines spewed ash over towns and forests on Sunday, prompting evacuations.
Authorities warn of possible further eruptionshttps://t.co/DQbzcsvHsZ pic.twitter.com/KZ57uanyaC
— AFP News Agency (@AFP) June 6, 2022
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Bulusan Volcano has been active in recent years, with a dozen similar eruptions recorded in 2016 and 2017. The Philippines is located in the seismically active Pacific 'Ring of Fire' and has more than 20 active volcanoes .
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