IUPD Chief Keith Cash said the female student met the suspect Friday night at a party. The two went to his room, where the rape allegedly occurred, Cash said.
The case is still under investigation.
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While the majority of students were away from campus during spring break, the IU Police Department remained active but without much activity to report.
The sign was on the Frances Morgan Swain Student Building's third floor.
IU administration, IUPD and Counseling And Psychological Service personnel were all in attendance.