Two male bodies were discovered by firefighters after they put out a fire at a Bukit Timah bungalow in the early hours of Sunday morning.
The Singapore Civil Defence Force were alerted to the fire at Jalan Gaharu, located just off Dunearn Road and near the Pan Island Expressway, at 4.16am.
Three other occupants, one male and two females, were sent to the National University Hospital for smoke inhalation. Investigations are ongoing.
The Straits Times understands that part of the house was used as a makeshift temple.