A public school teacher and 2 others were shot dead by suspects wearing police officers' uniforms in Dimataling town, Zamboanga del Sur on Tuesday morning.
The victims were identified as Saddat Ebrahim Bongga, a teacher at Laouriano Saludsod National High School; Sammer Ebrahim Bongga, a businessman; and Sadam Lam, a fisherman.
Authorities found 64 empty shells of M-16 rifle and 8 pieces of 9-mm caliber at the crime scene.
Suspects escaped on board a beige SUV.
An investigation is underway to determine the motive of the killing.