Earlier on Wednesday evening, the CBI received a notification from the Department of Personnel and Training and, thereafter, proceeded to register the case. (JPN/Agencies)
It also constituted a 20-member team of the Delhi-based special crime unit to probe the case.
The team, headed by a DIG-level officer, will visit Badaun on Friday along with forensic experts to examine and recreate the crime scene.
The agency will also seek the custody of the accused, who have been arrested in connection with this case by the Uttar Pradesh Police.
"We have received a notification from the government and registered a case," CBI Director Ranjit Sinha told reporters here on the sidelines of the investiture ceremony of the 17th batch of sub-inspectors of the agency.
CBI spokesperson Kanchan Prasad said the agency has asked the Uttar Pradesh government to extend logistical support to it for the probe.
The two girls, cousins aged 14 and 15 years, were gang-raped and murdered and their bodies were found hanging from a tree a day after they went missing on May 27 in a village in Badaun’s Ushait area.
The Uttar Pradesh Police have registered a case against seven accused, of whom five -- three brothers, Pappu, Awadhesh and Urvesh Yadav, and constables Chhatrapal Yadav and Sarvesh Yadav -- have been arrested.
In a twist to the case, Uttar Pradesh DGP AL Banerjee had 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 top cop had claimed that several important facts had come to light in connection with the case after an examination by experts.
He had said that although a lot of evidence could have been collected immediately after the discovery of the crime, local police had made no extra effort to do so.
The double rape and murder triggered nationwide outrage and Akhilesh Yadav-led government drew sharp criticism over the deteriorating law and order situation in the state with political parties and civil society activists calling for a CBI probe into the matter.
Congress vice-president Rahul Gandhi, Union Minister Ram Vilas Paswan and former Uttar Pradesh chief minister Mayawati had earlier visited the homes of the two victims and expressed their sympathies for the bereaved families.
The case has even drawn criticism from United Nations Secretary General Ban Ki-Moon.
"We have seen despicable attacks against women and girls around the world... I was especially appalled by the brutal rape and gruesome murder of two teenaged women in India who had ventured out because they did not have access to a toilet,” he said.
Earlier on Wednesday evening, the CBI received a notification from the Department of Personnel and Training and, thereafter, proceeded to register the case.