Duterte won the May 9 election by landslide largely on a pledge to kill tens of thousands of drug dealers and other criminals, and has urged the police and civilians to help in the killings.
More than 100 suspects have been killed in the seven weeks since Duterte's election.
One pre-dawn raid in the town of Matalam, about 900 kilometres south of Manila, left eight "drug personalities" dead today, including a woman, regional police spokesman Superintendent Romeo Galgo told reporters.
In Manila, police said they found a yet to be identified dead man, his entire head wrapped in tape, on a poorly lit road late yesterday. His torso was covered with a cardboard sign reading: "I Am A Pusher".
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Civil rights campaigners including two legislators called yesterday for an enquiry into recent months' police operations amid concerns at least some of the dead suspects could have been summarily executed by the lawmen.
Police have said they had operated within the boundaries of the law in killing 103 suspects between May 10 and July 7.