Police are investigating a spate of suspicious fires at Port Lincoln on Thursday, 5 October.
Around 4:30pm, police and fire crews were called to Stamford Terrace after reports of a series of small grass fires.
Police located six spot fires in the scrub area they believe to have been deliberately lit.
Witnesses reported seeing four young boys in the area at the time of the fires.
Anyone with information or who saw suspicious activity in the area is asked to contact Crime Stoppers.