The Supreme Court (SC) on Thursday said that the police`s delay in registering the unnatural death in the Kolkata rape-murder case is "extremely disturbing". A 31-year-old postgraduate trainee was brutally raped and murdered at RG Kar Medical College and Hospital in the West Bengal capital on August 9, triggering massive protests by doctors as well as common citizens across the country.

The court has taken suo moto cognisance of the case.