A bomb exploded outside a church in the southern Philippines during Sunday morning mass, killing five people and wounding 45, an army spokesman said.
Colonel Jonathan Ponce says rogue member of the Moro Islamic Liberation Front were suspected of placing the bomb near a food stall outside the church in Cotabato City.
He says the device was detonated when an army truck was passing.
A woman selling roast pork was killed on the spot while four others, including a soldier and three-year-old boy, died in a nearby hospital.
Five soldiers were among those wounded, Colonel Ponce said.
But Mohaqher Iqbal, a senior leader of the MILF, the largest Muslim rebel group in the mainly Roman Catholic Philippines, denied his group was involved in the attack.