The man was reportedly an outsider who had free access to the different departments of the hospital, he added.

Police on Friday said that the "semi-nude" body of the doctor inside the seminar hall of the college in Kolkata. The father of the victim had alleged that she was "raped" before being murdered in the hospital premises, adding that efforts were being made to 'hide' the truth.

The victim was a second-year student in the chest medicine department at the institution and had been on duty the previous night.

"We have arrested on person, who is an outsider. His activities are quite suspicious and he seems to be directly involved in the crime," the officer told news agency PTI.

Two interns were questioned the entire Friday night in connection with the ongoing probe into the doctor's death.

Hospital sources mentioned that the victim's body bore injury marks. There were scratch marks on the cheeks, around her nose, lips, in between eyebrows and the neck.

Notably, the preliminary autopsy report confirmed sexual abuse of the doctor before she was killed.

Meanwhile, the hospital has formed a 11-member enquiry committee for this incident, with the Kolkata Police also formed a Special Investigation Team (SIT) to probe the crime.

PROTESTS, DEMAND FOR CBI PROBE

The SFI and DYFI held road blockades across West Bengal to protest the murder of the doctor.

The SFI and DYFI, which are CPI(M)'s students' and youth wings respectively.

Nurses also held a rally demanding justice for the doctor, whose body was found inside the seminar hall of the government college in Kolkata.

Leader of the Opposition in West Bengal Legislative Assembly and BJP leader Suvendu Adhikari demanded a CBI inquiry into the death of a 31-year-old postgraduate trainee doctor.

He also urged student communities to protest against the state government's lackadaisical response.

Adhikari, in a post on X, "Unconfirmed reports suggest signs of strangulation and traces of seminal fluid. This appears to be a clear case of murder, possibly involving rape. The case should be immediately transferred to the CBI."

He further slammed the TMC-led state government and said, "Instead of addressing the issue seriously, the State Government has formed an 11-member inquiry committee, which bizarrely includes some interns. It seems the government is either trying to cover up its negligence or is not taking this matter seriously."

"I urge the student community, especially medical students, to protest vigorously against the state government's complacent attitude. I will provide all the support necessary to ensure justice for the deceased student," he added.