A mob gathered near the Durga temple and pounced upon three criminals before beating them up mercilessly, the Deputy Superintendent of Police (DSP) Saurabh Kumar Sah said.
An unidentified miscreant died due to internal injuries in a hospital, while two others were undergoing treatment, he said.
The miscreants were trying to escape after firing at a jeweller, Rajkumar Swarnkar and a customer, after their bid to loot jewellery was foiled at Swarnkar's house-cum-shop, Sah said.
The jeweller and the customer sustained injuries in the firing and were admitted to a hospital, the DSP said, adding an investigation was going on into the incident.