All cases of murder, attempt to murder and rape reported amid the outbreak of violence in West Bengal following the March-April elections need to be given to the CBI, the agency has written to the state police chief, officials said on Friday. The agency sought the details of such cases from the Director-General of Police in line with a Calcutta High Court order that directed the CBI to take over cases related to murder, rape and atrocities against women during the post-poll violence.