EVANSTON, Ill. (WLS) --Northwestern University campus police have received four reports of sex assaults in April.
The spat of reports have primarily come from anonymous callers and do not disclose the names of the people allegedly involved.
One of the assaults was reported to have happened on April 6 in the 600-block of Garrett Place in the shadow of the NU campus.
Annalise Sundberg walked her bike past that area on Friday and the news concerns her.
"I've never particularly felt in danger of a sexual assault, but the fact that it's happening right between where I work and where I live, that's scary," said Sundberg, a student.
Her concerns are echoed by fellow engineering students who spend many late nights in the library at the Ford Engineering building.
"I do try to look around and notice who is walking around me, but for the most part I really do feel safe on this campus," said student Christy Nachtigall.
University officials declined an on-camera interview, but stressed that a rapist is not running loose on campus.
Officials said that three of the alleged assaults came in after anonymous students told university officials that they thought they were sexually assaulted within the prior two weeks -- and every victim was acquainted with her perpetrator before and after the attack.
Federal law requires university police to feed reports of sexual assault into a database. Statistics from it are culled into a publicly available report from the Clery Center for Security on Campus.
In 2014, the campus had six sexual assault reports. There were eight in 2013 and three 2012.