New Delhi, Sep 4 - The Central Bureau of Investigation (CBI) Friday refused to confirm or deny reports that vaginal swabs drawn from teenager Aarushi Talwar, who was found with her throat slit in her suburban Noida home last year, were substituted with samples of an unidentified woman.

Dentist Rajesh Talwar's daughter Aarushi, 14, was found murdered in her parents' flat May 16 last year. Their domestic help Hemraj's body was found a day later on the terrace of the same building.

According to media reports, the Centre for DNA Fingerprinting and Diagnostics (CDFD) in Hyderabad has told the CBI that Aarushi's vaginal swabs were substituted with samples of an unidentified woman and the investigating agency now believes there was a conspiracy to destroy evidence in the double murder case.

According to the reports, the CDFD finding has forced the CBI to look at the possibility that Aarushi might have been sexually assaulted or had consensual intercourse before he was murdered -- though the three servants accused in the case didn't have the wherewithal to tamper with the evidence.

Asked about the reports, CBI spokesperson Harsh Bhal said: 'Regarding investigations into the Aarushi-Hemraj double murder case, we have to file a status report in the case, filed by Dr.