A Malaysian teenage boy has been acquitted in the murder of his 16-year-old female schoolmate, Yap Shing Xuen, after a judge ruled he was mentally unsound at the time of the killing. The boy, who was 14 when he fatally stabbed her in a toilet at their secondary school near Kuala Lumpur, was diagnosed with schizophrenia and found to have experienced delusions since the age of nine; he will now be detained indefinitely in a psychiatric hospital until deemed fit for release. The high-profile case deeply shook Malaysia and is widely credited with accelerating a government ban, enacted in June, prohibiting children under 16 from holding accounts on major social media platforms, amid concern that harmful online content may have influenced the boy's actions.