Fire & Rescue NSW personnel discovered the body at the scene of a shop fire in Sydney about 4.30pm today.
NSW Police said the body has not been identified and the gender is unknown.
Two people remain unaccounted for.
The fire engulfed a convenience store in Rozelle and surrounding units at around 4am this morning.
Earlier, police said they were searching for a mother and a baby and an unrelated man, who had been unaccounted for.
Sniffer dogs, cameras, listening devices and cherry-pickers were being used.
NSW Fire and Rescue (NSWFR) Superintendent Paul Johnstone said the blast had blown out windows up to 100 metres away.
Two residents jumped from the first storey of the burning building and another man was pulled out of the rubble by hand after being stuck under a refrigerator.
Police Superintendent Clive Ainley said there was a report of a car driving away from the scene when the explosion occurred.
"I don't know what part that car plays in the investigation at this time," he said.
Neighbour Anthony Carroll, who lost everything in the fire, said he was asleep in a unit next door where he lived with his father when he heard a massive explosion.
"Within 30 seconds my room was full of smoke," he said.
"I just grabbed what I've got on and got out of there.
"There were people screaming and yelling and people trapped in the place next door, so it was pandemonium."
MORE TO COME
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