Prima facie, it appeared the explosion occurred when the deceased were trying to dismantle a discarded mortar shell to extract copper from it.
"There was a loud explosion at around 10.15 am. People rushed to the house and found a wall shattered because of the impact of the blast," said Rohit Pal Singh Baghel, a lawyer residing in Gobar Chowki area under Tajganj police station. Niwas and Chotu had died on the spot.
Senior police officials, including senior superintendent of police (SSP) Subhash Chandra Dubey, and a few members of the bomb disposal squad reached the spot and started investigation.