ASI Surinder Singh died on the spot while traffic head constable Harpal Singh was injured, police said, adding, they were trying to stop the robbers from fleeing in a car, police said.
The robbers abandoned the car following a snag in the vehicle and snatched a bike from a man. They were later arrested with the help of the villagers.
The robbers had earlier looted Rs 17,000 and a gold ring from two women who were on a scooter.