The three persons last night entered the store posing as customers and attacked shop owner Surendra Kumar while one of them held the shopkeeper at gunpoint, a senior police officer said.
Unfazed, Kumar fought back despite one of the accused opening fire at him, the police officer said, adding the bullet missed Kumar and he raised alarm to alert passersby.
As Kumar raised alarm, the accused escaped from the spot, he said.
The shopkeeper alleged that he had called police thrice and reported the incident but the policemen did not act swiftly.
An investigation is underway in the matter and efforts are on to nab them with help of CCTV camera footage in which the incident was recorded, the officer added.