POLICE say a house fire at Carramar in the early hours of last Thursday is suspicious.
Emergency services were called to a home on Denison Street after reports of a fire at about 1.15am.
When firefighters from Fairfield and Chester Hill arrived flames and smoke were billowing from the front of the house.
NSW Fire and Rescue Inspector Kernin Lambert said crews quickly extinguished the blaze, as well as a search and rescue operation to ensure there was no one inside at the time.
"Intense heat and flames caused windows to break at the front of the house," he said.
"It was starting to spread to all rooms in the house when brought under control by firefighters."
While it took the fire brigade 30 minutes to bring the blaze under control, only one room was damaged.
Police said the occupants of the house were not home at the time and no one was injured.
Fairfield Police are investigating the circumstances surrounding the fire, which is being treated as suspicious.
They say they have information suggesting three males were seen running from the house shortly after the fire broke out.
Anyone who witnessed the incident or has any information should call Fairfield Police on 9728 8399.