More than 1,500 troops are involved in the offensive against the Bangsamoro Islamic Freedom Fighters (BIFF) in remote farming areas of the mainly Catholic country's Muslim south, regional military spokesman Colonel Dickson Hermoso said.
He said 17 BIFF members had been confirmed killed in this week's clashes, while two soldiers and one civilian were wounded.
The assault was launched yesterday, two days after the successful end of negotiations between the government and the Moro Islamic Liberation Front (MILF) aimed at ending a decades-long insurgency that has killed tens of thousands.
"Putting an end to the BIFF armed challenge will be a big help to the autonomous Muslim political entity that will be created by the peace agreement," Hermoso told AFP.
He said small arms skirmishes were continuing today in three farming villages on the edge of a marsh near the town of Datu Piang, about 800 kilometres south of Manila.
Hermoso said the BIFF had about 120 "hardcore" members who were backed up by scores of relatives and members of other armed groups opposed to the peace talks.
The MILF has been leading a rebellion since the 1970s aimed at winning independence or autonomy for the country's Muslim minority in the southern region of Mindanao, which they regard as their ancestral homeland.
But as the group sought a peace accord with the government, the BIFF broke away with its leader accusing the main Muslim rebel group of betraying Muslims' quest for independence.
