A retired Air Force officer and his wife were killed by suspected robbers in the wee hours on Monday at their house in Vasundra colony, police said.
"Ram Pratap and Bela Devi (both in early 60s) were sleeping at the first floor of their house when some unidentified persons entered the house and strangulated them during a robbery bid," SP J K Shahi said.
"Pratap's son, Krishna and his wife were sleeping at the ground floor, but they have denied of having any knowledge of the incident," the official said.
Krishna told police that neighbours informed him about commotion at the house.
"Prima facie loot appears as the motive. Bodies have been sent for post mortem and the investigation is on," he added.