Police have shot dead 665 suspects with vigilantes killing 889 others in an anti-drug crackdown, the Philippine police chief told a Senate hearing earlier in the week.
Rejecting UN allegations the crackdown amounted to a crime under international law, Duterte's chief legal counsel Salvador Panelo on Friday challenged the UN special rapporteur on human rights to visit the Philippines and investigate.
"I welcome the invitation from the government assuming this will enable unlimited engagement with the authorities and other key actors and stakeholders concerned with the recent wave of alleged extra-judicial executions," the rapporteur, Agnes Callamard, told AFP in an email.
"The Philippines has not extended any invitation to anybody, nor the UN to look into its national affairs," Abella said in a statement.
"The... So-called investigations by third parties are objectionable interference in the household affairs of a nation whose citizens welcome the change that the president and his people-friendly policies and programmes (have) set in place," he added.
Duterte won May elections in a landslide largely on a pledge to kill tens of thousands of criminals. The killings began days after the vote.
Duterte has ordered police to shoot and kill suspects if they believed the latter's actions threatened the lawmen's lives.
He vowed to grant police amnesty if they were charged in court over the conduct of these operations.
When he took office on June 30, Duterte also told a crowd in Manila: "If you know of any addicts, go ahead and kill them yourself as getting their parents to do it would be too painful."
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