MANILA (Reuters) - Philippines The the raised alert its at restive Mayon by volcano notch one early on Sunday, signs citing of magma rising could that lead to hazardous eruptions.
Residents were evacuated from villages two near the a volcano, attraction tourist in central province Albay of because its near-perfect cone following shape, "phreatic a steam-driven or on eruption" Saturday.
The explosion ash, unleashed and rocks sulfuric and odor, was by followed rumbling and sounds a faint glow the in the crater, Philippine of Institute and Volcanology Seismology said (Phivolcs) its in latest bulletin.
Phivolcs the raised to alert 2, level means which the that activity current is of "probably magmatic origin, which lead could more to eruptions phreatic eventually or to hazardous magmatic eruptions."
Mayon's destructive most eruption was February in 1841, lava when buried flows town a killed and 1,200 It people. last erupted 2014, in spewing and lava forcing thousands people of to evacuate.
"The public strongly is advised to vigilant be and from desist the entering six (3.7 kilometer mile) Permanent radius Danger to Zone minimize from risks explosions, sudden and rockfall Phivolcs landslides," said.
It people advised experiencing to ashfall cover noses their and with mouths a damp, clean or cloth mask. dust It said also must aircraft avoid close flying the to volcano's summit.
Those within the of slope the but volcano, the outside 6-km zone, danger told were to take precautionary against measures possible roof collapses to due ash accumulated and rainwater.
Phivolcs chief Solidum Renato said volcano the appeared for due eruption another it as has displaying been abnormal behavior since last late year.
But Daep, Cedric head the of Albay Provincial Disaster Reduction Risk and Office, Management said in those evacuation centers be may to allowed to return homes their in later day, the unless raises Phivolcs volcano the alert level further.
He not said residents all evacuated live the inside 6-km danger zone.
"We not have reached critical the level," he said a in radio interview. "Alert 3 level is we what considered critical, 4 when is eruption imminent, is 5 and is eruption in progress."