CBI officers working on the RG Kar rape and murder case said they are probing a possible change in the place of occurrence of the crime.

If the suspicion is found to be true, that would imply involvement of more than one person in the crime.

Sources in CBI said the investigating team visited the crime scene at least five times and a 3D videography of the site was done for a clearer understanding of the crime scene.

But the evidence collected so far does not seem to suggest beyond doubt that the postgraduate trainee was raped and murdered in the seminar hall and not brought there from some other place, sources said.

The CBI’s preliminary investigation has revealed that the resident doctors’ area and a washroom adjoining it on the third floor of the Emergency Building of RG Kar Medical College and Hospital were demolished based on a letter that Sandip Ghosh, then principal of the college, sent to the public works department (PWD).

Ghosh is in CBI custody for his alleged involvement in financial irregularities at RG Kar.

The letter was sent to the executive engineer of the PWD’s civil wing on August 10, a day after the young doctor was found raped and murdered in the seminar hall on the third floor of the Emergency Building. The demolition was subsequently paused.

CBI officers said the agency is preparing to inform the Supreme Court that it appeared that there was an urgency to demolish structures on the third floor of the Emergency Building.

The CBI will submit a report in the apex court during the next hearing on the RG Kar case.

Ghosh’s letter to the PWD, a copy of which is with this newspaper, said: “...there are deficiency of on duty Doctors’ Rooms and separate attached toilets in various departments of RGKMC&H, Kolkata”.

“You are hereby requested to do the needful immediately as per demand of Residents’ Doctors of RGKMC&H.... Please do the needful immediately.”

The letter also said “the issue (of renovation and construction of on-duty doctors’ rooms and attached toilets) is already discussed and resolved in the meeting” with the principal secretary in the health department and the director of medical education on August 10 “at the boardroom of the platinum jubilee building” of RG Kar.

CBI sources said it was “not quite clear why the process began from the third floor of the Emergency Building”.

Senior health department officials said they had not given any instruction to start the renovation from the third floor of the building.

State health secretary N.S. Nigam told Metro: “On August 10, the junior doctors at RG Kar Medical College and Hospital had complained about lack of certain facilities, including on-duty doctors’ rooms and attached toilets.... It was immediately decided that necessary funds would be released for repair and renovation of the on-duty doctors’ rooms and toilets. Nothing more. No instructions about where to start the work from were issued.”

A senior CBI officer said: “Our report is likely to mention the basic takeaways of the investigation and include some questions that remain unanswered, including the actual scene of the crime and its sanctity.”

The officer said: “Our report won’t be as detailed as the case diary. It will seek time from the apex court to probe more about the crime and identify the perpetrators.”

The CBI report is also likely to state that the preliminary forensic report did not throw up conclusive evidence about the involvement of anyone other than Sanjay Roy, who has been arrested, sources in the agency said.

Solicitor-general Tushar Mehta, who is representing the CBI in the Supreme Court, had earlier told the apex court that the crime scene had been “altered” by the time the agency took over the investigation.

Kapil Sibal, who is representing the Bengal government, denied the claim saying the entire investigation by Kolkata Police had been videographed.

Apart from raising questions on the crime scene and its sanctity, sources in the CBI said the report to the Supreme Court would outline the number of persons interrogated since the agency took over the investigation.

The list includes doctors, police, security guards and a section of the hospital staff.

The central agency has questioned several officers from the special investigation team of Kolkata Police that probed the rape and murder for four days till Calcutta High Court handed the inquiry to the CBI.

Almost all of those questioned were asked about when they reached the crime scene and what they saw. Agency sources said the officers wanted to see whether there were inconsistencies in the statements referring to the place of occurrence.

CBI officers have also spoken to Sanjoy Roy’s colleagues and those who were on duty with the victim on the night she was raped and murdered.