(CBS) – Parents at Mundelein High School reacted Friday to what some are calling horseplay-turned-hazing on the football and wrestling teams.

Five athletes were disciplined after behavior that included hitting and poking team members on the buttocks.

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“Our first reaction was being very disappointed in our young adults,” Mundelein High School District 120 Superintendent Kevin Myers said.

He says a non-student athlete heard talk about the latest case of bad behavior and reported it to school officials. The recent cases happened between September and December of 2014. But it’s believed inappropriate touching may have been going on since 2011.

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The school district encourages speaking up about bullying. There’s even an online form to report it.

“We need to be very proactive. We’re not taking this lightly. We want to also use this as a teaching moment for all of our students and our staff and community as well,” Myers said.

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He says the school and police performed a full investigation. The Mundelein police chief says investigators have consulted with each family involved, and they are not interested in pressing charges.