Manila, May 4 -- The public is advised to stay calm yet alert amid the recent activity in Mayon Volcano, the head of the Philippine Institute of Volcanology and Seismology (Phivolcs) said on Monday.

"Mayon Volcano at Alert Level 3 poses risks for ash fall, rock falls, lava effusion at pyroclastic density currents (PDCs). Stay calm but alert," Phivolcs Director Teresito Bacolcol said in a Bagong Pilipinas Ngayon interview.

He also reminded the public not to enter the six-kilometer permanent danger zone, to take precaution against ash fall, and heed official advisories.

The local government units should continue implementing safety restrictions and be ready in case evacuation is necessary, he said.

Several towns in Albay reported ash fa...