He said Dinesh entered the septic tank to clean it and the five others also went inside it to rescue him after realizing that he had fallen unconscious.
They also died after inhaling poisonous gases in the tank, the DSP said.
The other five were his wife Bachani Devi, sons Mohan Mahto and Basant Kumar, besides neighbours Sachin Mahto and Saroj Mukhiya, the deputy SP said.
The bodies have been sent for post-mortem.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)