At least seven soldiers and five communist rebels were killed in a clash in a northern Philippine province, the military said.
The main group signed a preliminary peace pact with the govt on October 15. The breakaway rebels ignored the accord and vowed to continue fighting.
Philippine communist rebels freed a town mayor and his two military escorts after more than two months in captivity.
Rebel attacks last year killed 187 government forces and dozens of civilians were caught in the crossfire.
Decades of fighting has neither wearied nor diluted the resolve of the Saudi Arabian-educated guerrilla.
Day in Pics: 29th August
August 29, 2014
Famous Ganesh Pandals in Mumbai