MANILA, Philippines - Officials say an 80-year-old woman has died and her son is missing after they were swept away by floodwaters in eastern Philippines, where landslides and flooding have prompted some 4,000 people to evacuate to safer ground.

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Albay province has been pummeled by nonstop rains for five days, and the provincial governor, Joey Salceda, has declared a state of calamity to free up provincial funds for disaster relief efforts.

Residents of at least five towns have been evacuated.

Disaster official Bernardo Rafaelito Alejandro says the woman who died was crossing a flooded area in Manito township late Wednesday when the strong current swept her away along with her 50-year-old son. Her body was found Thursday, but he remains missing.