CBI sources said the agency is likely to register today four cases in connection with the incident and start the probe into the killings during Saturday's violence.
The name of 44-year-old former UP Minister Raghuraj Pratap Singh alias Raja Bhaiya, who has a criminal record and has been jailed in the past, figures in the FIR lodged by the slain officer's wife Parveen Azad in which he has been accused of criminal conspiracy. Parveen had also demanded a CBI probe.
Raja Bhaiya, who resigned from the UP Cabinet after his name cropped up in the case, has refuted the charge.
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