The Central Bureau of Investigation on Tuesday conducted searches at the Ram Manohar Lohia Hospital's nurses' hostel in New Delhi. The search was conducted in the room of a nurse who has been arrested on the charge of assisting Amit Kumar, the alleged kingpin in the multi-crore rupee kidney transplant racket.

The CBI team searched the room of Linda, a Manipuri woman arrested by the Haryana police on January 31 and took away some documents related to the case before sealing it, official sources said.

Linda had come in contact with Kumar during her initial years in the nursing profession. Though she was working in RML Hospital as a staff nurse, she had been providing part-time services to Amit Kumar, the sources said.

The documents collected from her residence were being analysed as the CBI is now trying to trace the people whose kidneys were taken out, the sources said.

In a related development, Saraj Kovid, a doctor who had surrendered before a court in Gurgaon court on Monday, was today remanded to the CBI's custody for 14 days.

Meanwhile, 40-old Kumar, who was brought from Nepal last weekend, was cooperating with the CBI team in all respects, the sources said.

The CBI officials and forensic experts, who conducted searches at his residence on Monday, were of the opinion that the house was fully equipped to conduct an operation any time, they said.

The CBI claimed to have recived some clues from the searches conducted yesterday at his house and some guest houses, but refused to divulge the details.

CBI teams have fanned out in neighbouring states to nab Kumar's brother Jeevan, against whom an Interpol Red Corner Notice was issued on February 1.

The questioning of Amit Kumar, who was remanded to the CBI custody till February 22, continued for the fourth day to ascertain about the foreign links of his racket.

CBI registered a case against Kumar and others on February 8 under Sections 420 (cheating), 342 (illegal confinement), 326 (causing grievous hurt), 506 (criminal intimidation) and 120-B (criminal conspiracy) and section 18 and 19 of Transplantation of Human Organs Act of 1994. The case was transferred to the CBI by the Haryana government.

Kumar, who was arrested by the Nepalese authorities, was brought back to India on Saturday, two weeks after the racket came to light on January 24.