A mushroom of volcanic ash shoots up into the sky from Mount Mayon, one of the Philippines' most active volcanoes, after daybreak as seen from Legazpi city in Albay province, about 285 miles southeast of Manila, on Tuesday, May 7, 2013. (AP Photo/Philippine Institute of Volcanology and Seismology)

A mushroom of volcanic ash shoots up into the sky from Mount Mayon, one of the Philippines' most active volcanoes, after daybreak as seen from Legazpi city in Albay province, about 285 miles southeast of Manila, on Tuesday, May 7, 2013. (AP Photo/Philippine Institute of Volcanology and Seismology)