Babloo Yadav, son of slain village head Nanhe Yadav who allegedly shot Haq dead using a country-made gun, was apprehended here, CBI sources said.
The sources said CBI has detained two brothers of Nanhe Yadav and members of his domestic staff in connection with the DSP's murder and is likely to arrest them soon.
The sources claimed Babloo, who is over 19 years of age, has, during intense grilling by CBI officials, confessed to have shot the police official. The officials were able to reproduce the complete chain of events which took place on March 2, 2013.
CBI sources claimed Haq, who was posted as Deputy Superintendent of Police at Kunda, had reached the house of Nanhe Yadav after getting the news of his murder.
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By the time he approached the site, the news of Yadav's murder had spread and a large crowd gathered outside his house which was angry at the alleged apathy of the police and protested the police's alleged failure to stop the murder.
At the house of Nanhe Yadav, Haq met a mob which entered into a scuffle with him while his fellow policemen allegedly deserted him, the sources said.
CBI sources claimed that enraged by the killing of his father and uncle Suresh Yadav, Babloo Yadav, who had a country-made gun, came out of his house and shot Zia-Ul-Haq dead who was being beaten up by a mob.