Sailkumari, the wife of Rajdev Dixit, one of the deceased, had not attached the new LPG cylinder to the regulator-pipe which resulted in leakage, according to the police.
When she tried to light the gas-stove, it led to the blast.
Sailkumari herself suffered 90 per cent burn injuries and was being treated at government-run Kasturba Hospital. Her husband Rajdev, his brother Kapil Dixit (40) and Rajdev's sons Yashwant (17) and Jeetendra (20) were declared dead upon arrival at V N Desai Hospital.