India, Dec. 8 -- A day after a couple suffocated to death inside their grocery shop in Delhi's Tikri Kalan, their family demanded a thorough probe into "how electric current flowed through the shop's shutter", preventing anyone from pulling it open during the blaze.

Vineet (31) and his wife Renu (29) died after getting trapped in their smoke-filled shop on Friday evening. They are survived by their two children -- Aditya, 10, and Om, 8. After noticing smoke drifting out of the shutter, the children first raised an alarm, calling their uncle in panic.

"He tried to pull the shutter up, but the moment he touched it, he was thrown back. There was current flowing through it. How can that happen? We want to know the truth," Renu's sister, Alka,...