Northwestern University officials are investigating reports that several students may have been sexually assaulted and drugged at fraternity houses, according to a report.

In one incident, four female students “were possibly given a date-rape drug” at the Sigma Alpha Epsilon fraternity house in Evanston on Jan. 21, the Chicago Sun-Times reported, citing a security alert from the university.

Two of the students believe they were sexually assaulted, the paper reported.

Another student said she was sexually assaulted—possibly with the use of a date-rape drug—at another fraternity house on Thursday, the university said. It was unclear where the alleged incident occurred.

Northwestern’s Sexual Harassment Prevention Office is investigating the reports.

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