Accused started their shooting spree from a general store last night when they shot and injured a shop owner Anup Goyal after he asked them for money for cigarettes at Vinay Nagar under Bahoripura police station area, Inspector General (IG) Adarsh Katiyar said.
He said that the assailants also shot and injured one S S Chouhan, who came to the rescue of Goyal.
Goyal sustained bullet injury on his chest while Chouhan suffered a wound to his arm.
Miscreants fled away with Gautam's service revolver, he added.
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After assaulting the policeman, the duo went to a medical store- Satya Sai Baba and asked for a cough syrup with high alcohol content from two Robin and Himanshu - both brothers looking after the shop.
While the two were looking for the syrup, angry over the delay, the miscreants shot and injured Robin, the IG said, adding, soon after the attack police encircled the city.
The IG said that those injured are being treated in a hospital and a massive manhunt was on to nab the miscreants.