The CBI on Thursday moved the Supreme Court challenging the acquittal of dentist couple Rajesh and Nupur Talwar in the sensational 2008 twin murders of their daughter Aarushi and domestic help Hemraj.

The move by the agency came months after Hemraj's wife had in December last year approached the top court against the Allahabad High Court verdict of October 12 last acquitting the couple.

The CBI filed an appeal challenging the high court order , CBI's spokesperson said.

The high court had freed the couple on the ground that they could not be held guilty on the basis of the evidence on record.

Earlier, a CBI court at Ghaziabad had sentenced the Talwars to life imprisonment on November 26, 2013.

Before the high court's order came, Rajesh and Nupur Talwar were serving their life sentences in Ghaziabad's Dasna jail.

Fourteen-year-old Aarushi was found dead inside her room in the Talwars' Noida residence with her throat slit in May 2008. The needle of suspicion had initially pointed at 45-year-old Hemraj, who had gone missing, until his body was recovered from the terrace of the house two days later.

As the Uttar Pradesh Police drew flak for shoddy probe, the case was referred to the CBI on the recommendation of then Chief Minister Mayawati.