In major observation, the CBI on Thursday informed the Supreme Court that the crime scene where a postgraduate trainee doctor was allegedly raped and murdered on duty at RG Kar Medical College in Kolkata, was tampered with. On August 9, a postgraduate trainee doctor was raped and murdered on duty at RG Kar Medical College in Kolkata, which has led to nationwide strikes and protests by the medical fraternity. The alleged rape and murder of the junior doctor in a seminar hall of the state-run hospital has sparked nationwide protests.