CBI is collecting DNA samples of all persons associated with the postmortem of teenager Aarushi Talwar, whose murder had hogged national focus, to find the identity of the woman whose vaginal swab was sent to CBI for forensic tests.

A CBI team, probing the 18-month-old Noida double murder case, has visited slain teenager Aarushi Talwar's parents and conducted searches at a hospital in Noida where the postmortem was conducted.

A PIL was filed in the Supreme Court on Saturday urging it to monitor the investigations being conducted by CBI into the sensational murder of teenaged girl Aarushi Talwar and her domestic help Hemraj.

Onto investigations after Aarushi's Talwar's mobile phone was recovered in Bulandshahar earlier this week. The CBI is looking for the people who used the four sim cards on the mobile phone since it went missing after Aarushi's murder in May last year.

Delhi Police on Monday claimed to have recovered the mobile phone of Aarushi Talwar, the teenaged school girl whose murder at her Noida residence still remains unsolved, from Uttar Pradesh's Bulandshahr.