Emergency services have found a body in the rubble of an inner western Sydney convenience store that was destroyed by an explosion.

Bianka O’Brien, 31, and her 12-month-old son Jude, along with 30-year-old Chris Noble, are missing after the blast ripped through the shop and several apartments at a popular cafe strip on Darling Street in Rozelle in the early hours of Thursday.

Search and rescue teams are continuing to comb the rubble brick by brick for any survivors of the blast that authorities are treating as suspicious.

Police have not yet identified the body and the gender is currently unknown.

Fire engulfed a convenience store in Rozelle.

The three missing people lived in apartments at the back of the convenience store.

The mother and child were in one unit while the missing man was in another, police said.

Officers have spoken to their relatives but are yet to release any information about them to the public.

“The people who are unaccounted for, we are in contact with their family and we are now speaking to them,” Leichhardt area commander Inspector Clive Ainley said.

As police try to determine the cause of the fire, they were also looking for a silver sedan seen leaving the area at the time of the explosion.

“This fire is being treated as suspicious unless something is determined otherwise,” Inspector Ainley said.

“We haven’t examined the crime scene. We are still in the rescue phase. That’s our primary objective.

“We [know about] a silver sedan. I’d be calling on the public with any information to contact Crime Stoppers if you have any information about this car.”