Police registered a case against the killers under section 148,149 and 302 of PPC on the complaint of Tahir Javed, brother of Mushtaq.
SSP (Operations) Irfanullah Khan said investigation had been launched and the police would look into the possibility of terrorism or enmity. He said the three shopkeepers were said to have long-standing friendship.
He said area people told the police that three suspects had been seen in the market prior to the incident. He said the dead bodies had been shifted to the morgue for autopsy.