The bodies of 65-year-old woman Chaumi Hembram, her 40-year-old son Somai Hembram and daughter Jammi Hembram (35) were recovered from their house.
The three were apparently killed with sharp weapons but the motive and the identity of the killers was yet to be established, the sources said.
The incident occurred on Wednesday night but the police were informed only last evening.
As the place of occurrence was 35 km deep in the naxal-affected jungle, a police team left for the spot this morning and fetched the bodies in the evening, the sources said.