Delegates have begun arriving in Kazakhstan for peace talks on Syria brokered by Russia and Turkey.
President Rodrigo Duterte took a swipe at a UN official for suggesting he should be charged for murder.
Both parties say they are not giving in on which terms should be followed in the conduct of the probe.
Foreign Affairs Secretary Perfecto Yasay says United Nations Special Rapporteur Agnes Callamard should apologize because her arbitrary findings "unfairly damaged the country."
Deaths involving the state are possibly extrajudicial and must be investigated, says United Nations special rapporteur Agnes Callamard.
United Nations Special Rapporteur Agnes Callamard rejects government's conditions in the probe on the spate of killings.
DFA officials denied reports that the government has cancelled its invitation for UN special rapporteur Agnes Callamard to investigate alleged extrajudicial killings in the country.
Wonder Woman's battle for equality for women and girls at the United Nations has come to a untimely end.
UNICEF is calling on world leaders to reduce air pollution, saying it leads to the deaths of more children yearly than malaria and HIV/AIDS combined.
The terror group carried out the mass killings Wednesday, punishing people who had defied its orders, a spokeswoman for the UN human rights arm told CNN.
Duterte turns down Bato's offer to resign
De Lima: Duterte to blame for alleged 'tokhang for ransom'
Dela Rosa won't resign over kidnap-slay
Police arrested over Korean kidnap-slay
Trump sworn in as U.S. President
Trump vows 25 million jobs, most of any president
Apple iPhone sales top expectations