A special police task force has been set up to investigate the case of a 66-year-old patient whose eyes were gouged out in a mental hospital ward in Gaozhou, Guangdong province.

Police have not released any details of the case but, according to local media, forensic experts have ruled out the possibility of the patient having been attacked.

According to doctors, Huang Chaoqiang developed a mental health condition in March following a stroke.