A woman says someone sexually assaulted her at a fraternity house near the University of Chicago campus early Sunday morning, according to Chicago police and an alert by the university.

Police said the alleged assault happened in the home in the city's Hyde Park neighborhood around 2 a.m. A 21-year-old woman says a male sexually assaulted her inside of a residence, and she self-transported to the University of Chicago Medical Center for treatment.

An alert by the University of Chicago said the incident occurred during a party at a fraternity house.