They have caused damage to the roof tiles of the school and the police are keen to speak to witnesses or anyone who knows who the vandals are.
Darwen PCSO Stuart Knowles said: “Running on roofs not only causes damage which the school can ill afford to repair, but is also highly dangerous.
“I would appeal to anybody that knows the people responsible or with any information that could assist with our investigation to come forward. “
Anyone with any information should call Lancashire Police on 101.