Thousands of people evacuated from base of Mayon volcano in Philippines . Scientists warn that the volcano is about to explode . The volcano has already erupted 49 times since 1616 . Comment:
Thousands of people evacuated from base of Mayon volcano in Philippines . Scientists warn that the volcano is about to explode . The volcano has already erupted 49 times since 1616 . Audible booming and rumbling sounds first heard Sunday .