Two fires, one in Christies Beach and the other in Christie Downs are being treated as suspicious.
Shortly after 3am on Monday morning, August 13, Police and MFS were called to the Christie Downs property where two vehicles had been set alight.
No injuries were reported, however the two vehicles were destroyed.
An hour later another fire was reported, this time in Christies Beach.
Occupants of the house managed to exit through the back door of the house, escaping injury.
While the fires are not believed to be linked, they are both being treated as suspicious.
Anyone who saw or heard any suspicious activity or has any information that may assist the investigation is asked to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperssa.com.au