The deceased have been identified as Gurjeet, his elder brother Jaspal and his wife Sweety. They were found dead outside their house in Model Town late Thursday.
According to the officer, at around 11.20 p.m., the two businessmen brothers started fighting outside their house over parking spaces.
"During the scuffle, Jaspal first attacked Gurjeet with a sharp weapon. When he collapsed on the road, two Personal Security Officers (PSO) fired indiscriminately at Jaspal. A stray bullet also hit his wife Sweety."
"The PSOs escaped the spot after the incident," a senior police officer said.
The police were alerted by neighbours. The investigators are examining CCTV footages.
"Property disputes were not new among the two brothers. The bodies have been sent for autopsy and the next of kin have been informed," he added.
