CBI on Wednesday arrested seven persons in the murder case of Kunda DSP Zia-Ul-Haq in Pratapgarh in Uttar Pradesh. They include the security guard of influential MLA Raghuraj Pratap Singh alias Raja Bhaiya.

CBI sources said in Uttar Pradesh said the seven persons allegedly incited the mob to kill the DSP, when he arrived there after getting information about the murder of village head Nanhe Yadav.

They said one of the person, who allegedly led the mob to the kill the officer was Bhulle Pal, a security guard with the then State Minister Raja Bhaiya who has been named by the slain officer's wife in her FIR as the main suspect.

The sources said four persons – son, two brothers and a domestic help of Nanhe Yadav — have already been arrested taking the total number of those taken in to custody in the case to 11.

Among those arrested, Chhote Lal Yadav, Ghanshyam Saroj and Ramashray were associates of village head Nanhe Yadav, who was murdered hours before the killing of the DSP and Chhote Lal Yadav and Munna Patel were his neighbours.

CBI has already recovered the weapon, allegedly used in the killing Haq.