The Indian Medical Association on Wednesday announced it has suspended the membership of former RG Kar Medical College and Hospital Principal Sandhip Ghosh amid nationwide ongoing protests over the rape and murder of a PG trainee doctor in the state-run medical facility in Kolkata, media reports said.

The Central Bureau of Investigation has been grilling Ghosh, whose role came under scanner following the death of the doctor in the college,  for the past several days.

Ghosh has been accused of negligence in the matter.

The CBI on Sunday raided the residences and offices of Dr. Ghosh, ex-MSVP Sanjay Vashisth and 13 others in Kolkata.

When reporters asked whether evidences are found, a CBI official said, "Bahut kuch hai (a lot is there)."

The CBI's Anti-Corruption Branch is probing into the alleged financial irregularities by Dr. Ghosh, who was controversially posted to the Calcutta National Medical College by the government after he quit from RG Kar following the students' protests over the rape-murder.

Meanwhile, Dr. Ghosh appeared before the CBI on Monday again in connection with the rape-murder case that has triggered massive public outrage across the country and brought the Mamata Banerjee government under scanner over its alleged cover-up.

The trainee doctor was allegedly raped and murdered at the seminar hall of RG Kar Medical College and Hospital, which is located in North Kolkata's Belgachia area on the intervening night of August 8 and 9.

The incident triggered countrywide protests since it came to light earlier this month.