Narendra, Gopal and Raju fainted inside the septic tank in a house while cleaning it in Hirabagh colony in Bhopalgarh police station area, the police said.
The son of the house owner, Vipin Chittora entered the tank to rescue them but he too fainted, police said.
They were rushed to a nearby hospital where doctors declared them dead on arrival. The postmortem was conducted today, the police said.
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