Suspicious SA fires destroy cars, house

Suspicious fires have destroyed two cars and extensively damaged a vacant house in South Australia.

Members of the public put out the first car fire in Elizabeth Vale about 11.30pm on Friday.

The car was extensively damaged, police say.

A second car parked on train tracks in Elizabeth North was gutted by fire about an hour later.

Police are still trying to find the vehicle's owner. In the third incident, a vacant house was extensively damaged in a fire in Charlson St, Davoren Park just before 3.30am Saturday.

All three fires are being treated as suspicious.