Fighting broke out in the south a day after President Benigno Aquino asked Congress to pass a Muslim autonomy law for the region, a key step to ending a decades-old rebellion that has claimed tens of thousands of lives.
About 20 BIFF rebels opened fire on a military detachment late yesterday, then attacked an army unit sent out to confront them early today, said Major-General Edmundo Pangilinan, an army commander on the major southern island of Mindanao where the Bangsamoro Islamic Freedom Fighters (BIFF) operates.
He said residents recounted to the military seeing up to 10 rebels dead in today's two-hour gunbattle, though no guerrilla bodies were recovered.
If the death toll is accurate, it would be the deadliest clash in Mindanao involving the BIFF since July, when 17 rebels and a soldier were killed in a single day.
More From This Section
The BIFF split from the main Muslim rebel group, the Moro Islamic Liberation Front (MILF), in 2008.
The 10,000-strong MILF signed a peace agreement with the Aquino government in March with the aim of creating an autonomous region for Muslim-dominated areas in the south of the largely Catholic nation.
Last month the BIFF pledged allegiance to the Islamic State, extremist jihadists who now control large swathes of Iraq and Syria.
The MILF has condemned the IS actions and vowed to stop the spread of the group's "virus" into the Southeast Asian nation.