The incident took place in east Delhi's Khureji area.
"A call was received at 5.15 a.m. regarding a blast in an oven in the three-storey bakery, where over 20 labours were working," a fire official told IANS.
Five fire tenders rushed to the spot to douse the flames, the official added.
According to police, the blast occurred on the first floor of the building where the oven was kept.
Condition of two injured was said to be critical. The victims -- Rahul, Sajid and Dilshad -- all succumbed to their injuries in a hospital, a police official told IANS.
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