Police are investigating the cause of a fire at a vacant home in St Marys this morning.
About 2am today, emergency services were called to Lethbridge Street, St Marys, following reports of a home well alight.
Officers from Nepean Police Area Command established a crime scene and are investigating the circumstances surrounding the incident.
Firefighters were on scene extinguishing the blaze. No one was injured during the incident. The home is currently unoccupied.
The cause of the fire is yet to be determined; however, initial inquiries have led police to believe the fire is suspicious.
Investigations are continuing and anyone with information is urged to come forward.
Police are urging anyone with information in relation to this incident to call Crime Stoppers on 1800 333 000.