Port Lincoln Junior Primary School has expressed concern after the school was vandalised up to six times during the summer holidays.
The school reported about five or six incidents of vandalism that dated back to before Christmas with the latest occurring late Sunday.
We're very appreciative of local SAPOL and our local security services who have been very vigilant and responsive.Kathy Davison
The vandalism included the front gate ripped off its hinges, a section of fence being ripped off, 15 sections of broken windows and glass on the doors of the resource centre and two classrooms being smashed.
The school is yet to assess the full damage costs but it is expected to be in the thousands of dollars.
"The ongoing, senseless vandalism is deeply disappointing to our whole school community," principal Kathy Davison said.
Four youths were apprehended by police after allegedly breaking into a classroom at the school at about 11.30am on January 3.
A police spokesperson said security and police patrols responded after silent alarms activated at the school grounds.
"Police caught the four youths running from the scene.
"An 11-year-old boy, a 12-year-old boy, a 15-year-old boy and a 15-year-old girl were all arrested and charged with aggravated serious criminal trespass and will be dealt with via the juvenile justice system."
Police are investigating the other damage caused to the school during the holidays.
Mrs Davison said the school was thankful for the security and police response to the incidents.
"We're very appreciative of local SAPOL and our local security services who have been very vigilant and responsive," she said.
While alarms are already in place the school will look at increasing security on the school grounds, which could include installation of CCTV cameras in the central playground area.
Police urge local residents living near schools to keep an extra eye and ear out during the school holidays.
Anyone who sees any suspicious activity, people or vehicles in or around school grounds at any time of the day should ring the police assistance line on 131 444.