Bansal's wife Satyabala (57) and daughter Neha (27) left separate suicide notes, saying nobody was responsible for their death, police said.
Joint Commissioner of Police (Eastern range) Satish Golcha said the police received a call around 1.30 pm following which teams were rushed to the spot.
"Two separate suicide notes have been recovered. Prima facie there seems to be no foul play. However, investigations are being carried out and bodies have been sent for postmortem," he said.
CBI had carried out searches at eight locations in connection with the case during which the agency had claimed to have made cash recoveries.
According to the CBI, Bansal was arrested while receiving Rs nine lakh of the Rs 20 lakh promised as bribe.
