Police are investigating a suspicious house fire at Morphett Vale.

Just after 4am today (Tuesday 1 November), police and MFS crews were called to a house in Flavian Crescent after reports the premises was on fire.

The blaze was extinguished by fire crews and no one was home at the time of the incident.

Police believe the fire was deliberately lit and ask anyone who may have seen suspicious activity in the area to call Crime Stoppers on 1800 333 000, or online at www.crimestopperssa.com.au