Banksia Hill call for help issued by WA children's commissioner after Casuarina Prison youth riot

Conditions at Banksia Hill and the moving of some inmates to Casuarina Prison have been condemned. (Four Corners)

WA children locked down in juvenile detention need far greater mental health support, according to the woman appointed to look after the interests of the state's children.

Commissioner for Children and Young People Jacqueline McGowan-Jones made the observation after visiting Banksia Hill Detention Centre on Friday, where the bulk of WA's youth offenders are held.