Manila, April 25 -- Philippine National Police (PNP) chief Gen. Rommel Francisco Marbil on Friday ordered the Cagayan police to conduct a thorough investigation into the killing of reelectionist Mayor Joel Ruma of Rizal town.

Marbil issued the directive when he visited the wake of Ruma.

The PNP chief then proceeded to Barangay Illuru Sur where Ruma was shot dead by a still unidentified assailant during a campaign sortie on April 23.

Marbil also met the members of the Rizal Police Station, encouraging them to be diligent in resolving the death of Ruma and to ensure the public of a peaceful May 12 elections.

"Our people's safety is our responsibility, and they feel more secure when they see us on the streets, especially in areas with hi...