New Delhi/Ghaziabad: The Central Bureau of Investigation (CBI) on Friday arrested Krishna, the compounder of dentist Rajesh Talwar, in connection with the murder of teenaged Aarushi Talwar and her family's domestic help Hemraj in Noida last month.

CBI joint director Arun Kumar told reporters in Delhi, "We have carried out two tests - polygraph test and narco analysis test on Krishna in Bangalore. We conducted two other tests before leaving for Bangalore. A psychological test was conducted on him in AIIMS on June 9. On the basis on these, we have arrested him." Arun Kumar refused to divulge details of the tests, but said that "investigations are on".

Telephonic conversation

It is not clear on what charges the police have arrested Krishna. A CBI team earlier on Friday conducted a psychological test on Talwar, arrested for the alleged killings of his teenaged daughter and the domestic help. The investigating agency also arranged a telephonic conversation between Talwar and a close friend in Middle East.

The CBI visited Dasna jail in Ghaziabad to conduct the test on Talwar. The test was held in order to "synchronise" the sequence of the crime, revealed a source in CBI.

The CBI refused to divulge details of the conversation between the dentist and his friend. Sources in the CBI is looking for a "third person", who allegedly executed the murders.