Kolkata: The CBI interrogated former principal Sandip Ghosh for the third consecutive day in connection with the RG Kar Medical College incident. The former principal was confronted by journalists as soon as he left his residence in Beleghata.


Quoting sources, an ABP Ananda report said Sandip Ghosh's mobile phone call records are being thoroughly examined. Investigators are checking who all he spoke to on the day of the incident, and for how long. They are also probing if he sent or received any messages via SMS, the sources said.


The role of the former principal has been under scrutiny from the very beginning of the RG Kar Medical College incident. 


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The family of the deceased doctor has repeatedly spoken about the conduct of Ghosh, and expressed doubts about the investigation. 


"I can't understand what’s happening with the investigation. It has been a week, and they have only managed to arrest that Sanjay Roy. With each passing day, I am losing hope," the victim's mother was quoted as saying in the ABP Ananda report. 


She added: "The principal is being interrogated continuously, but why isn’t he being arrested? What is the CBI trying to find out from him that we don’t know?"


According to the report, the central agency visited RG Kar Medical College once again on Sunday. The team went to the fourth floor of the emergency wing, where the doctor's body was found in a seminar room. 


Renovation work had recently started in the room directly opposite to where the body was discovered, but it was halted after a controversy erupted. 


Sources told ABP Ananda that the CBI has asked the former principal to submit the copy of the order under which the renovation work was initiated.


The CBI is also questioning Sandip Ghosh about why a wall near the seminar hall was demolished. 


The investigation into the doctor’s rape and murder at RG Kar Medical College was initially being carried out by the Kolkata Police, but it was handed over to the CBI on the direction of the Calcutta High Court. Now, the Supreme Court has also taken suo motu cognisance of the case. A three-judge bench led by the Chief Justice of India is set to hear the matter on Tuesday.