COTABATO CITY, Jan. 10 -- A retired police official who worked as head of the civil security unit of Polomolok, South Cotabato, was killed by still unidentified gunmen Monday noon, police said.

Lt. Col.Marvin Duadua, acting chief of the Polomolok police, said retired Maj. Donald Cabigas, was the third member of the Polomolok civil security unit killed since Friday last week.

"We deeply sympathize with the bereaved family and rest assured that a deeper investigation will be conducted," Duadua said in a statement Tuesday.

"To the community, we are asking for your cooperation by giving us information that will lead to the possible identification of the culprits," he added.

Cabigas, 56, was inside his business establishment at Tuazon Subd...