The police have collected 228 DNA samples from residents at Idaman Apartment, Damansara Damai, as part of the investigation to search for the killer of a six-year-old autistic boy, Zayn Rayyan Abdul Matiin.

Selangor police chief Hussein Omar Khan said the large-scale operation, which involved house-to-house checks and the collection of DNA samples from the residents began yesterday and would continue until today...