Michigan State University attempted to sabotage and slow prosecutors' investigation into the school's handling of sexual abuse by Larry Nassar, investigators said Friday.

NBC News reported that special counsel Bill Forsyth, who is leading the investigation into Nassar's pattern of abuse while employed as a physician at Michigan State, argued that the university deployed a series of tactics designed to obstruct prosecutors.

“Their biggest concern was the reputation of the university,” Forsyth told reporters.

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NBC reported that Forsyth released a report updating the investigation that accused the school of "drowning investigators in irrelevant documents," asserting attorney-client privilege when it did not apply and replying to document requests with materials unrelated to the investigation.

Nassar was sentenced in January to up to 175 years in prison for sexually abusing women and girls while he was a doctor for Michigan State University and for USA Gymnastics.

More than 150 women testified against Nassar, describing instances where he had abused them during their time at Michigan State or on the Olympic team.

Former Michigan State President Lou Anna Simon resigned on the same day Nassar was sentenced. She has since been charged with lying to police in the investigation into Nassar.

The U.S. Olympic Committee fired its chief of sports performance earlier this month after an independent investigation found that he and several other individuals took no action to protect athletes after being told of abuse allegations against Nassar.