India, March 24 -- The Calcutta high court asked the Central Bureau of Investigation (CBI) on Monday to clearly spell out whether the 31-year-old trainee doctor killed at Kolkata's RG Kar Medical College and Hospital on August 9 last year was raped by a single person or gang-raped.

The high court, which has also asked the agency if there was a conspiracy behind the crime, also ordered CBI to produce the case diary related to its investigation on the next date of hearing on March 28.

The order was passed by a bench of justice Tirthankar Ghosh on a petition filed by the parents of the young doctor who was killed. They are seeking a fresh investigation.

Justice Ghosh asked CBI if it ever found reasons to believe that the crime was committ...