Philippine Marines raided a Muslim guerrilla camp in a southern jungle, killing 13 rebels in a five-hour battle, a military official said.
The fight took place Saturday on Jolo island, about 590 miles south of Manila, the latest of a series of battles in the southern Philippines.
The military learned of the rebel casualties through two-way radio intercepts, said Lt. Gen. Roy Cimatu, the southern military chief.
Cimatu said the rebels were Abu Sayyaf guerrillas and followers of Nur Misuari, the former governor of an autonomous Muslim region in the southern Philippines. Misuari is being detained in Malaysia.