A call was received at 7.05 AM about the fire and a fire tender was rushed to the spot, an officer of Delhi Fire Services said.
It is suspected that the fire started from an LPG cylinder and engulfed the entire house. The blaze was doused by 9 AM and the injured were taken to a hospital, he said.
The injured have been identified as Lallan (45), his wife Anjali (40) and their sons Ashish (15) and Aditya (10).
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