Police arrested two youths following a break in at a Port Lincoln school on Saturday night.
Police responded to alarms at Kirton Point Primary School just after 6pm on Saturday.
Security officers reported seeing two youths run off from the school and police found both boys nearby.
The boys had left behind two cordless drills which police discovered had been stolen from another break-in.
The owner of the stolen drills has since been identified.
The teenagers were searched and police located keys, a mobile phone and a bullet which were also believed to be stolen.
The two Port Lincoln boys, aged 15 and 14, were charged with aggravated serious criminal trespass, theft and unlawful possession.
The 14-year-old was also charged with possessing ammunition.
Both boys were refused police bail and will appear in the Port Lincoln Youth Court on Monday.