Maybe call police regardless. My son and many of his friends went through something very similar at school, but not in sports camps. None of them told anyone. All are paying the price a decade later. A very high price. Depression, anxiety, relationship issues... a decade later... Many kids.

We talked to the police after we found out, but it was too late. The period for them to be able to do anything had passed. These kids won't stop without serious consequences. Please at least talk to the school. I think talking to police should be seriously considered. This is NOT boys will be boys. These are real sex crimes and will result in many kids permanently scarred.