The Central Bureau of Investigation on Tuesday said the twin murder, including that of Aarushi, was a pre-meditated plan and not done on the spur of the moment, as claimed by Noida police.

Coverage: Aarushi Murder Case

Highly placed sources in CBI said the 'murderers', who could be two in number, had planned these murders well in advance and studied all cover-up operations meticulously.

With this observation, the theory of Noida police that Rajesh Talwar had allegedly murdered his daughter Aarushi and domestic help Hemraj on the spur of the moment has fallen flat.

Sources said killers had gained friendly entry into the house before committing the ghastly crime.

Special court declines to hear Dr Talwar's bail plea

Meanwhile, CBI on Tuesday conducted the second lie detector test on Krishna, compounder of Dr Rajesh Talwar, in connection with the gruesome twin murder, they said.

Evasive in his replies on Monday, the sleuths of Special Crime unit of the CBI on Tuesday sent a fresh questionnaire to CFSL officials for enabling them to put Krishna through the polygraph (lie) detector again, official sources said.

A CBI team had re-visited the Talwar's residence in Noida on Monday night and re-created the entire crime scene again, based on the statement given by the compounder.

Some of the relations of Aarushi and Hemraj were also questioned today as well by the agency.

In a related development, the CBI team continued its search for murder weapon and the location this time was the banks of river Hindon in Ghaziabad. However, success continued to elude them.