<p>Kolkata: CBI officers on Thursday visited the residence of the doctor who was raped and murdered at a Kolkata hospital, and spoke to her parents as a part of their investigation, an official said.</p>.<p>The investigators took note of the time they received the call from the hospital, informing them about the death of their daughter, he said.</p>.<p>The officers also asked them about their daughter's friends, and whether she complained of any problems at the state-run RG Kar Medical College and Hospital where she was a postgraduate trainee doctor, he added.</p>.'Demonic act': PM Modi calls out crime against women in I-Day speech as Kolkata doctor’s rape-murder ignites mass protests.<p>"It was difficult to speak to a couple who have lost their daughter in such a manner," the officer said.</p>.<p>The CBI also interrogated five doctors of the hospital, its former medical superintendent-cum-vice-principal (MSVP), principal and the head of the Chest Department where the victim's body was found, he said.</p>.<p>The CBI also spoke to the officer-in-charge of the Tala police station, under the jurisdiction of which the hospital is located.</p>.<p>The investigators have sought details of Civic Volunteer Sanjay Roy's call detail record and mobile tower location, among others. He was arrested after the victim's body was found on Friday.</p>.Doctors' body writes to CBI alleging attempt at evidence tampering in Kolkata rape, murder case.<p>"We are also looking into data consumed by his mobile to ascertain whether he made any video or internet voice calls," the officer said.</p>.<p>A CBI team also visited the hospital during the day, and spoke to intern doctors, nurses and others present there on the fateful night, he said.</p>.<p>The CBI took over the investigation into the case from the Kolkata Police on the direction of the high court.</p>
<p>Kolkata: CBI officers on Thursday visited the residence of the doctor who was raped and murdered at a Kolkata hospital, and spoke to her parents as a part of their investigation, an official said.</p>.<p>The investigators took note of the time they received the call from the hospital, informing them about the death of their daughter, he said.</p>.<p>The officers also asked them about their daughter's friends, and whether she complained of any problems at the state-run RG Kar Medical College and Hospital where she was a postgraduate trainee doctor, he added.</p>.'Demonic act': PM Modi calls out crime against women in I-Day speech as Kolkata doctor’s rape-murder ignites mass protests.<p>"It was difficult to speak to a couple who have lost their daughter in such a manner," the officer said.</p>.<p>The CBI also interrogated five doctors of the hospital, its former medical superintendent-cum-vice-principal (MSVP), principal and the head of the Chest Department where the victim's body was found, he said.</p>.<p>The CBI also spoke to the officer-in-charge of the Tala police station, under the jurisdiction of which the hospital is located.</p>.<p>The investigators have sought details of Civic Volunteer Sanjay Roy's call detail record and mobile tower location, among others. He was arrested after the victim's body was found on Friday.</p>.Doctors' body writes to CBI alleging attempt at evidence tampering in Kolkata rape, murder case.<p>"We are also looking into data consumed by his mobile to ascertain whether he made any video or internet voice calls," the officer said.</p>.<p>A CBI team also visited the hospital during the day, and spoke to intern doctors, nurses and others present there on the fateful night, he said.</p>.<p>The CBI took over the investigation into the case from the Kolkata Police on the direction of the high court.</p>