MANILA, July 31 (Xinhua) -- Four people were killed on Tuesday night in a shooting incident that erupted in Bula, Camarines Sur province of the Philippines, police said on Wednesday.

The four male victims were drinking when attacked by two gunmen in Fabrica, a village in the Camarines Sur province south of Manila, at around 8:20 p.m. local time, according to the local police.

Police investigators recovered empty shells of .45 caliber and .9 mm pistols from the crime scene.

Police are still trying to find the motives for the attack and conducting investigation to identify the suspects, according to the local police.