But say they have found not found any evidence of a victim or a gunman.
Reports of a shooting near Northwestern University on Wednesday was all a "hoax" and a "swatting incident", IL police said.
The first alert came at 2.40pm Wednesday, via the Northwestern University Emergency Notification System, stating: 'This is not a drill.
Chicago reports someone told police the suspect was armed in Engelhart Hall on campus. "Seek shelter if in the area".
University officials called for those in the area to shelter in place while police responded. A man called police at 2:17 p.m. and said he had shot his girlfriend at 1915 Maple Ave., Engelhart Hall, a graduate student housing dorm.More news: Chelsea 'to demand £53m if Borussia Dortmund try to sign Michy Batshuayi'
About 3:40 p.m., the university updated their alert to say that that anyone in Englehart Hall should continue to remain behind locked doors, but that people outside the building no longer needed to shelter in place.
Police later confirmed in a press conference that they believe the incident is a hoax after police met with the alleged victim in person and found that she was safe.
The university later tweeted that there is no threat to Northwestern students not near to Engelhart Hall, but anyone who is not in the area should stay away until further notice. "We're still treating this as an active investigation".
Police said the campus was secured and students were safe during a briefing about 4:15 p.m.