Kolkata: The elderly nun, who was gangraped at a convent in Nadia district in West Bengal, was discharged from hospital early on Friday morning.

Ranaghat sub-divisional hospital superintendent A N Mondol said the Sister Superior of Convent of Jesus and Mary, who had been declared fit for discharge, was released from hospital at around 2:45 am.

"She was officially discharged at 2:20 AM but it took another 25 minutes for her to collect her belongings and leave," Mondol said. The Medical Board had earlier conducted tests on the nun and found her to be physically and mentally fit, Mondal said.

The 75-year-old nun was admitted to the hospital after being brutalised by dacoits at the convent at Gangnapur in Ranaghat in the early hours of March 14. CID teams visited the convent on Thursday and were seen taking photographs and making sketches of the convent building.

The West Bengal government had on March 18 decided to hand over the case to the CBI as the demand for justice grew louder with the culprits still at large. But the investigating agency is yet to formally take charge of the case.

No arrest have been made even five days after the incident though 15 persons have been detained in connection with it, police said.