Gunmen on motorcycles also murdered three petty criminals in Mr Duterte's hometown of Davao, police said, deepening fears of mass extra-judicial killings once the controversial politician begins his six-year term on June 30.
Police insisted the eight drug suspects were killed lawfully, with the officers only firing back after being shot at in three separate raids.
One occurred in Manila, another near the capital, and the third in a small town in the northern Philippines.
