ZAMBOANGA CITY, Philippines — One person was killed and at least five others wounded in a bomb blast late Wednesday while two more improvised explosives were detonated in a village near the southern Philippine port city of Zamboanga, officials said.

Senior Superintendent Edwin de Ocampo, chief of the local police force, said two bombs planted at a lottery outlet and at another site about 100 meters away were discovered. Police were in the process of detonating two of the bombs when the third device went off hitting a roadside eatery in the village of Sangali at around 9:15 p.m., about 30 kilometers east of downtown Zamboanga.

De Ocampo said the three improvised explosives were planted almost 100 meters apart from each other. He said the fatality, a civilian, was killed when he tinkered with the third improvised bomb as policemen were detonating the two other explosives.

“The civilian was killed on the spot by the powerful blast,” he said.

Police had initially said two people had died in the blast but later revised the total to one dead.

One police bomb expert said the bombs were assembled from ammonium nitrate-fuel oil and packed with concrete, nails and detonator. The deadly chemical mixture is used primarily in mining and quarrying operations.

The military said it deployed troops to secure civilians in the area. It said no group or individual claimed responsibility for the attack. “”We still don’t know the motive or who was behind it,” Army Lt. Col. Randolph Cabangbang, a spokesman for the Western Mindanao Command, told CNN.

On Oct. 9, 10 people were injured when two separate explosions took place as the city was preparing for the feast of Our Lady of Pilar.