Four high school wrestlers in Oklahoma were charged with rape Monday after what officials called a "disturbing" hazing incident on a school bus after a tournament.

An 18-year-old, a 17-year-old and a 16-year-old were each charged with three counts of rape by instrumentation. Another 17-year-old was charged with one count. Norman North High School previously suspended all four students.

Prosecutors say the suspects held a 16-year-old wrestler under bus seats and attacked him, while a 12-year-old wrestler was lured to the back of the bus and attacked as well after the Jan. 9 tournament in Pauls Valley, according to Fox 25.

"These are minors, juveniles that experienced this," Norman Police spokeswoman Sarah Jensen told reporters. "They go to school and these are their peers, so we were especially careful in this case to protect the victims."

School officials fired a wrestling coach in charge of supervising the team. Court records do not list attorneys for any of the teenagers.

Norman Public Schools Superintendent Dr. Joseph Siano responded, "Student safety is a top priority and we followed procedures we have in place that allow us to effectively investigate and take swift action in these situations. We appreciate the individuals who came forward to provide information, the Norman Police Department's thorough investigation and the quick action by the District Attorney on this incident."

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The Associated Press contributed to this report.