The bodies have been sent for autopsy, the officer said.
Following a complaint by the victim's second son Sachin Kumar, an FIR has been lodged against eight people, including two unidentified persons, under relevant sections of the Indian Penal Code (IPC), including 302 (murder), Prasad said.
Two of those named in the FIR -- Jitendra Sharma and Sharmendra Sharma -- have been arrested. The others named in the FIR are Ramendra, Upendra, Gyandendra and Gajendra Singh, he said.
Efforts are being made to arrest the remaining accused, he added.