Police are investigating two suspected arson cases in Adelaide overnight, believed to be linked.

Events began at 2am today when firefighters and police rushed to a blaze at a barber shop at on Hancock Road, Ridgehaven, in the city’s north.

Despite the efforts of firefighters, the building was extensively damaged. Smoke and water also damaged adjoining buildings.

Adelaide police are investigating two suspicious fires.© Nine

Then at 2.45am, a fire broke out in the front yard of a home in Fitzroy Terrace in the western suburb of Thorngate.

The quick-thinking owner extinguished the blaze before emergency services arrived, preventing any damage to the house.

No one was injured in either fire.

Detectives and crime scene investigators are treating the fires as suspicious.

Police also believe the incidents are linked.

Anyone with information is being urged to contact Crime Stoppers online or call 1800 333 000.