OKLAHOMA CITY (AP) — The Oklahoma State Bureau of Investigation says it's looking into a federal lawsuit's allegations that a middle school student was sexually assaulted and threatened by classmates over 18 months while school officials did nothing to stop the attacks.

The now-14-year-old boy and his parents filed the lawsuit Monday in Oklahoma City. It says Washington Public School Superintendent A.J. Brewer and Principal Stuart McPherson treated the assaults as "horseplay" or "accidental touching."

School attorney Andy Fugitt said he's aware of the lawsuit but declined additional comment.

The lawsuit says athletes assaulted the boy several times, including once in class in front of other students with no teacher present.

Oklahoma State Bureau of Investigation spokeswoman Jessica Brown said Wednesday that the agency will provide a report to local prosecutors "in a few weeks."