Australia's Turnbull 'shocked' by juvenile detention abuse video

A teenager who has become the face of a juvenile detention scandal has thanked Australians for their support.

Images of Dylan Voller cuffed to a mechanical restraint chair drew widespread condemnation after they were aired on television.

Australian PM Malcolm Turnbull on Tuesday convened a royal commission to examine treatment of juvenile inmates in the Northern Territory.

Phil Mercer reports.