"We recovered seven bodies from the scene early today and sent four other suspected robbers to the (local) Araihazar health complex with critical wounds," a police officer told PTI.
Another person died later in the day, taking the total number of deceased to eight.
The officer said residents of the neighbourhood raised an alarm using a megaphone as the robbers came in a truck and broke into the rice warehouse late last night and began to load the rice sacks in the vehicle.
The mob, he said, threw the bodies into a pond from where the police recovered them and those injured have been sent to hospital.