The agency will also seek the custody of the accused who have been arrested in connection with the case by Uttar Pradesh Police.
Seven people have been booked by the state police. Five of the seven accused -- two constables Chhatrapal Yadav and Sarvesh Yadav and three brothers -- have been arrested. The three arrested brothers are Pappu, Awadhesh and Urvesh Yadav.
In a twist to the case, Uttar Pradesh Director-General of Police A.L. Banerjee earlier claimed that rape of one of the victims was not confirmed while suggesting that property could be one of the motives behind the crime. The double rape and murder triggered nationwide outrage and the Akhilesh Yadav government has drawn flak over the law and order situation in Uttar Pradesh. (IANS)