MANILA – Four people, including a police officer, were killed and four others wounded in a shooting incident on Sunday night during a town fiesta celebration in the northern Philippines' Isabela province, police said Monday.

Police said the victims were attending a fiesta gathering in front of the house of the killed police officer around 7:50 pm Sunday when unidentified gunmen suddenly opened fire on them.

Police said the suspects fled in a van and two motorcycles after the attack.

Police recovered seven cartridge cases from the scene, and an investigation is underway.