A former Hong Kong prison officer has admitted severely wounding an inmate by repeatedly thrusting a stick into the man’s rectum after being sprinkled with baby powder during a game.

Tam Lik-chung, an ex-assistant officer in the Correctional Services Department, pleaded guilty in the District Court on Monday along with an inmate, Ho Lik-wun, who had helped hold down the victim.

Tam, 33, had been overseeing young inmates at Pik Uk Prison in Sai Kung at the time of the assault in December...