Manila, Jan. 29 -- Two more dead dolphins were found in Bais City, Negros Oriental, following a mass stranding, bringing the total number of fatalities to five.

Authorities suspect the dolphins died from lung trauma caused by blasting sounds.

City Veterinarian Dr. Melanie Pescadilla said Wednesday that necropsy results revealed lung lacerations in three of the four examined dolphins, consistent with injuries caused by intense underwater pressure or loud explosions.

"They died of drowning secondary to blast trauma," Pescadilla said, noting that dolphins' auditory organs are located near their lungs, making them vulnerable to powerful underwater sounds.

The dead dolphins, identified as pantropical spotted dolphins, were recovered over s...