A woman who reported interrupting the sexual assault of her friend at a fraternity party near the University of Chicago told NBC 5 what she saw the night of the  alarming  incident.

The woman, who asked to remain anonymous for fear for her safety and the alleged victim's safety, said she was at a party at Alpha Epsilon Pi Fraternity's Lambda Chapter when a friend called her over to a bathroom.

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The friend had been banging on a door where another friend was locked inside. Eventually the lock to the door was picked and the woman said she went into the bathroom and was  shoved. 

 I made him get off of her and told him like to leave and to get away and then he like was trying to act like he didn't do anything,  she said.  And then I helped her put her clothes on and then I had to kind of help her walk out- me and my friend as like human crutches. 

After helping her friend, she said she saw the same man who was inside the bathroom with his friends and the group was  laughing and cheering. 

She said confronted the man and chased him as he ran from the scene.

She called the situation  emotional, taxing, alarming, disturbing. 

Police were called after the 21-year-old woman reported being sexually assaulted just feet away from the U of C campus. In an email to students, campus officials said the victim, who isn't affiliated with the university, was attending a party at the house at the time.

Officials said someone intervened, and the suspect ran from the scene. The victim was subsequently taken to the University of Chicago Medical Center for treatment.

A person of interest was identified Tuesday and has been banned from school grounds, university officials announced, noting that the fraternities are  not recognized student organizations.  In a message to students, school officials said the unnamed individual was not a U of C student and was not affiliated with the university.

The house where the incident happened is associated with Alpha Epsilon Pi, whose national organization has said it is cooperating with the investi
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