By Matt Siegel and Tom Westbrook SYDNEY (Reuters) – Australian Prime Minister Malcolm Turnbull on Tuesday ordered an inquiry into the treatment of children in detention after the airing of video showing prison guards teargassing teenage inmates and strapping a half-naked, hooded-boy to a chair. The Australian Broadcasting Corporation (ABC) aired CCTV footage late Monday of inmates in a Northern Territory juvenile detention center also being stripped naked, thrown by the neck into a cell, and held for long periods in solitary confinement. “Like all Australians, I've been deeply shocked – shocked and appalled by the images of mistreatment of children,” Turnbull said on ABC radio as he announced a Royal Commission, Australia's most powerful, state sanctioned inquiry.