CBI sources said Raja Bhaiya was quizzed about his location at the time of crime, his alleged association with Pal family which is seen as prime suspects in the murder of Nanhe Yadav besides other details.
The sources said unlike yesterday when several of his associates including his cousin Akshay Pratap Singh was also questioned, CBI today grilled only Raja Bhaiya over aspects of the crime which took place on March 2 evening this year.
CBI has also taken into custody Rajeev Singh and Guddu Singh who are considered close to the former minister.
In the FIR filed on the basis of a complaint by the slain DSP's wife Parveen Azad, it has been alleged that on the directions of Raja Bhaiya, Nagar Panchayat Chairman Gulshan Yadav, Hari Om Srivastava, Raja Bhaiya's driver Rohit Singh and supporter Guddu Singh first assaulted her husband with sticks and rods and later shot him dead.