Five youngsters were helpnig detectives with their inquiries following an alleged arson attack at a Paulsgrove School.
Windows were damaged at Hillside Middle School, Allaway Avenue during the weekend.
But police also found a number of small fires had been lit in the classrooms when they entered the building.
Paint had also been poured in a school office.
A spokesman for Cosham CID said: ‘It was more mindless vandalism than arson, but a number of fires had been lit – including in some desks.
‘Apart from the windows the damage was fairly minimal, and of nuisance value.’
PICTURED: School caretaker Reg Perrit, 60, with the burnt paper and books.