The Central Bureau of Investigation (CBI) has booked former UP minister Raghuraj Pratap Singh alias Raja Bhaiya for criminal conspiracy and murder of UP police officer Zia-Ul Haq.
The agency - which filed four FIRS on Thursday – had taken over the case following a recommendation from the UP government.
The government's hand had been forced by the furore over the murder of Haq - deputy superintendent of police and Kunda circle officer - and the demands of his wife Parveen Azad.
Singh had to step down as the minister after Azad accused him of conspiracy and the UP police booked him. Haq had apparently taken action against Singh's close associates to check illegal mining and according to his wife, perceived a "threat". Hence, the CBI would also probe the action Haq took against close associates of the former minister.
"A team of investigators would be reaching Kunda tomorrow," said a CBI officer in Delhi on condition of anonymity. The 10-member team would be led by deputy inspector general Anurag Garg.
The state police have named five persons for Haq's murder. But the agency would question all the 23 men -- including Singh - named in the four FIRs filed by the police.
The CBI will also record the statements of the constables from Kunda and Hathigawan who accompanied and later deserted Haq.
In view of the controversy over the number of bullets hitting the DSP, the agency did not rule out the possibility of a fresh postmortem. Initially, the UP police had claimed three bullets hit Haq, but the postmortem report indicated the mark of only one bullet.
Haq's service revolver, cellphone and the bullet that hit him are still missing. Finding them would be a key task for the agency.
"All three are vital for the investigation," said a CBI officer in Lucknow.
"The failure of the district police to recover them even after six days of the murder has quite puzzled us."