The Junior Doctors’ Front on Friday asked why the CBI arrested former RG Kar Medical College principal Sandip Ghosh and former Tala police station officer-in-charge Abhijit Mandal if it could not even file a chargesheet against them.

The Sealdah court on Friday granted bail to both, who have been accused of “destruction of evidence” and “criminal conspiracy” in the RG Kar rape-and-murder case.

The junior doctors cited the CBI’s allegations of “deep conspiracy” and “evidence tampering” and asked why it could not file a chargesheet against Ghosh and Mandal mentioning the charges.

“Why did the CBI arrest them if the agency could not even file a chargesheet against them?” asked Asfakulla Naiya, a postgraduate trainee doctor at RG Kar Medical College and Hospital and one of the faces of the junior doctors’ protests between August and October.

The protests were triggered by the rape and murder of a junior doctor, whose body was found in a seminar hall on the third floor of the Emergency building at RG Kar on August 9.

CBI sources said an arrested person cannot be kept in custody if the investigating agency does not file a chargesheet within 90 days of the arrest.

“The CBI had mentioned evidence tampering and deep conspiracy in its primary chargesheet (in which only one accused has been named, Sanjay Roy). Then why could not they file a supplementary chargesheet against these two persons?” asked Aniket Mahata, a junior doctor.

“We are disappointed. The central agency has to take responsibility for this,” Mahata said.

“We invite the civil society to protest what is happening. The Junior Doctors’ Front will extend all support. We at the front will soon announce our programme,” said Mahata.

“If you go back to our previous statements, you will see that we never said that justice had been achieved just because the probe was handed to the CBI. We expressed the hope that the truth would finally be revealed.”

The Junior Doctors’ Front also asked why the state government is not giving consent to prosecute Ghosh and former RG Kar house staff Ashis Pandey in a case related to alleged financial irregularities at the medical college.

Solicitor general Tushar Mehta, representing the CBI, told the Supreme Court on Tuesday that the agency had sought the sanction on November 27, two days before submitting a chargesheet in a lower court in Calcutta.

The court has yet to take cognisance of the chargesheet as the state sanction is pending.

The junior doctors will march from Karunamoyee to the CGO Complex in Salt Lake, where the CBI office is located, at 2pm on Saturday.