The Central Bureau of Investigation (CBI) on Thursday registered four First Information Reports (FIRs) in connection to the killings of Deputy Superintendent of Police Zia-ul-Haque and two others at Pratapgarh district in Uttar Pradesh last week.
The probe agency has named former Uttar Pradesh minister Raghuraj Pratap Singh alias Raja Bhaiya and four others in one of the FIRs, reports said.
A CBI team will reach Pratapgarh to investigate the case.
Following a request from the Uttar Pradesh government, the Centre on Thursday handed over to the CBI the probe into the killings of Zia-ul-Haque and two others in the state last week.
Uttar Pradesh Chief Minister Akhilesh Yadav on Monday ordered a CBI inquiry into the killing of Zia-ul-Haque.
Akhilesh Yadav on Wednesday visited the family of slain village head Nanhe Yadav at Kunda town in Uttar Pradesh and said people involved in the conspiracy will not be spared.
Zia-ul-Haque along with Gram Pradhan of Balipur village Nanhe Yadav and his brother were killed on Saturday.
Raja Bhaiya on Monday resigned after he was booked a day ago in the killing of the Deputy Superintendent of Police.
Akhilesh Yadav told NDTV: "Whichever minister has been involved in wrongdoing, we will definitely order an enquiry."
The police, however, have not questioned or arrested Raja Bhaiya so far.
Meanwhile, the autopsy report of Zia-ul-Haque has revealed that the cop, who went to probe into the murder of Pradhan (village headman) and his brother in the Kunda village was beaten and dragged along the ground before being shot dead, the Uttar Pradesh police said. He had severe injuries on his legs and head.
It is also not clear whether the bullet that killed the cop was shot from his own revolver as it is missing along with the bullet that killed him.
The autopsy report revealed that his body was marked by "lacerated wounds and abrasions" and that he died of "hemorrhage and shock" from a gunshot wound to the right of his chest, said reports.
According to allegations, the four men accused of dragging and killing the slain cop were men of Raja Bhaiya.