Eight of the 10 inmates, including two Chinese, were allegedly involved in drug cases.
Duterte's response comes after Supreme Court chief justice criticised his aggressive campaign.
Photo of couple went viral but leader determined to stamp out trade. 770 people killed in police operations.
Civil society calls on UN drug control agencies to publicly condemn the atrocities in Philippines.
China's Supreme Court says it will safeguard the country's territorial sovereignty and maritime interests.
Philippine National Police chief vows to obey the country's commander-in-chief.
The website was offline for roughly 10 hours following threats to the publication
Liu Xiaoming's comments come as China and Philippines get set to discuss maritime dispute.
Millions of Filipinos trust their new leader, despite his hard-line position on the drugs trade
Philippines had confirmed two days ago that the Isis-linked Abu Sayyaf is behind this kidnapping.
Beijing wanted to discuss bilateral issues with Manila except the South China Sea dispute.
The US is trying to calm things down in the wake of The Hague ruling against China.
China was criticised for 'harming' coral reef ecosystems and interfering with traditional fishing rights.
In one of the deadliest single incidents, police killed eight "drug personalities" during a pre-dawn raid.
Indonesia's intelligence chief says they are trying to trace the location of the hostages.
Spruance, Momsen and Stethem patrol amid rising tensions.
Philippines: Dozens executed by police in drug war in five days since President Duterte's inauguration
In addition, 11 policemen were tested positive for illegal drug use in the country.
The ruling on the dispute is expected on 12 July but China wants to solve the issue bilaterally.
Philippines: Notes left on corpses as 60 drug dealers executed by police following Rodrigo Duterte election
President-elect previously said he would dump the bodies of 100,000 criminals in Manila Bay.
The meeting will aim to strengthen ties between Beijing and Hanoi and to ward off disputes.
Abu Sayyaf: Fellow hostage describes how Isis-linked group celebrated executions of John Ridsdel and Robert Hall
Hall was executed by Abu Sayyaf on 13 June; Ridsdel was decapitated by the group two months earlier.
The controversial new president who spoke out about killing drug dealers is set to take office shortly.
Flying an upside down flag in the Philippines has a grave meaning.
The Islamic State-linked group had demanded a $6.37m for Hall's release.
In a nod to vigilantism, Duterte has asked urged people to kill drug dealers who fight arrest.
Philippines: Rodrigo Duterte sparks outrage after saying journalists 'are not exempted from assassination'
'You are not exempted from assassination if you're a son of a b***h,' said Duterte.
Video features Kjartan Sekkingstad, Robert Hall and Marites Flor, all held since September.
Chinese Foreign Minister Wang Yi accuses Washington of 'double standards' in maritime dispute.
Geraldine Roman tells IBTimes UK about her struggles with gender and her landmark political victory.
History is made in Catholic Philippines as Geraldine Roman takes 62% of the vote.