Former Philippine President Rodrigo Duterte is set to return to his longtime political stronghold as Davao City mayor, winning by a landslide despite being detained at the International Criminal Court (ICC) in The Hague.

It is up to the Department of the Interior and Local Government to say who will exercise the functions of mayor of Davao City while former President Rodrigo Duterte is detained in The Hague, the Commission on Elections said on Tuesday.

Election officials say former Philippine President Rodrigo Duterte has been elected as mayor in his home city by a landslide, despite his detention by the International Criminal Court.