Three people have been arrested and a fourth is being sought by police following an incident at a Port Lincoln school early Thursday morning.
Police allege at about 3.45am patrols were called to a school on Mortlock Terrace following reports of people attempting to break into a shed.
An 18-year-old man, an 18-year-old woman and a 16-year-old boy, all from Port Lincoln were arrested and charged with being unlawfully on premises and theft.
They were bailed to appear in court at a later date.
A fourth suspect is wanted by police and anyone with information is encouraged to call Crime Stoppers on 1800 333 000 or go online at www.crimestopperssa.com.au.