It was Monday about 1 a.m. in the Watterson Towers residence hall, when university police say a female student was attacked and sexually assaulted by someone wearing a black ski mask and eye covering.
The student reported fighting back, eventually breaking free, and contacting police with the help of Housing Staff.
No suspect is in custody.
Illinois State University Police are investigating the incident and are urging all students to follow Housing security and safety protocols.
Illinois State University is in the city of Normal, about 130 miles southwest of Chicago.
