DUMAGUETE CITY, Jan. 10 -- Three police officers and a woman were shot and killed in two separate but related incidents in Sibulan, Negros Oriental on Friday evening.

Capt. Stephen Polinar, spokesperson of the Negros Oriental Police, said the suspect in both incidents has voluntarily surrendered to authorities.

"PSSg (Police Staff Sgt.) Bonifacio Saycon surrendered about an hour after the shooting incidents to the police in Tanjay City and turned over his issued firearm. He will be subjected to illegal drug testing," Polinar told the Philippine News Agency.

The fatalities were identified as Capt. Jose Edrohil Cimafranca, the police chief of Sibulan town; Senior Master Sgt. Tristan Chua; Patrol Officer Rey Albert Temblor; and Sheila Mae...