The 79-year-old faces a charge of "the crime against humanity of murder", according to the ICC, for a crackdown that rights groups estimate killed tens of thousands of mostly poor men, often without proof they were linked to drugs.

Duterte was arrested after landing at Manila's international airport following a brief trip to Hong Kong.

While Duterte has insisted he was not responsible for any unlawful deaths, police estimate killing 6,000 people in his anti-drug campaign.

It was unclear who the former president was speaking to in the video.

A tough-talking populist and self-professed killer, Duterte's anti-crime campaign resulted in the deaths of thousands of alleged dealers and addicts.

Philippine President Rodrigo Duterte says that "genocide" was taking place in Myanmar and he was willing to accept Rohingya Muslim refugees fleeing from it, though Europe should help too.

Security footage shows the man responsible for one of the Philippine capital’s deadliest attacks in years casually exiting a taxi just after midnight and walking calmly into a vast entertainment and gambling complex like any other visitor.

Protests against a surge of killings are unleashed since Rodrigo Duterte became president of the Philippines and pledged to wage war on drug dealers and crush widespread addiction to methamphetamine.

Incoming Philippine president Rodrigo Duterte yesterday hit out at "stupid" human rights campaigners, as he defended his imminent war on crime and emphasised the death penalty was for retribution.

Philippine President-elect Rodrigo Duterte says he will seek to return the death penalty, in his first comments to reporters since last week's election.