Port Lincoln Police are in the process of investigating a series of break-ins and thefts from homes and cars overnight, with 13 property offences taking place.
Investigators and crime scene examiners were called to properties on Oxford Terrace, Matilda Street, Eric Avenue, Highview Drive, Walkley Road, Hambridge Street, Stanley Grove, Mena Place and Flinders avenue yesterday.
Police have said in a majority of the incidents, thieves have entered properties through unlocked house doors and windows as well as unlocked cars.
Items reportedly stolen include house keys, car keys and mobile phones.
In several cases car keys were taken from homes and then used to unlock secured vehicles.
In one case a witness reported seeing a suspicious man on Highview Drive early yesterday morning.
The witness described him as being of Aboriginal appearance, about 18 years old, tall with a slim build and wearing a green hooded jumper.
Police will be deploying extra patrols in the area.
SAPOL have also issued a reminder to residents that while leaving windows and doors open in hot weather for the cool evening breeze may sound like a good idea, doors and windows should remain locked at all times.
The community has been urged to immediately report any suspicious activity by calling The Police Assistance Line on 131 444.
Anyone that has had their house broken into or property stolen and have yet to report it to police have been asked to call the Port Lincoln Police on 8688 3020.
Anyone with information about these offences is asked to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperssa.com.au.