SCDF said that shouts of help could be heard coming from inside the unit when they arrived and firefighters from Sengkang Fire Station and Punggol Fire Station “conducted forcible entry through the front door”.
The unit was smoke-logged and the firefighters had to carefully manoeuvre their way into the unit, it added.
According to SCDF, five people were found inside one of the bedrooms and rescued by the firefighters.
They were taken to Singapore General Hospital for smoke inhalation and one of the adults also sustained minor burn injuries.
About 50 residents from the affected block were evacuated by the police and SCDF as a precautionary measure.
“Preliminary investigation indicates that the fire is likely to have been caused by an electrical origin in the kitchen,” said SCDF.