Still groping to pin down the killer or killers of Noida girl Aarushi and her domestic help Hemraj, the Central Bureau of Investigation on Monday conducted a lie detector test on Rajkumar, domestic help of the Durranis, family friend of dentist Rajesh Talwar, accused of murdering his daughter.

With the CBI probing all aspects of the case including the role of neighbours and their domestic helps, the agency searched the garage at a Noida locality Jal Vayu Vihar where one domestic help Vijay Mandal was staying.

"Today's searches have been conducted in one of the garages of Jal Vayu Vihar where one Mandal, a servant working in the same building, was living. Rajkumar, servant of Dr Anita Durrani, has also been subjected to polygraph test," CBI Joint Director Arun Kumar told reporters in Delhi.

He said the CBI has received an interim report from Andhra Pradesh Forensic Science Laboratory, Hyderabad, relating to the digital camera seized from the Noida dentist's house.

The CBI official said the lie detection test of Aarushi's mother Nupur Talwar was conducted on June 13 and she was also subjected to psychological analysis at All India Institute of Medical Sciences on June 7.

He, however, termed as "speculative" media reports of the imminent arrest of Dr Nupur Talwar.

These reports "have no basis as of now," he added. Talwar's compounder Krishna, at present in the custody of the CBI, was taken to Noida on Monday morning where searches were again conducted to trace the mobile phone of Aarushi and Hemraj, besides finding the weapon with which they were murdered.

His custody ends tomorrow and will be produced in a Ghaziabad court.