RIVER FOREST, Ill. (WLS) -- The lockdown at Concordia University Chicago in River Forest was lifted following a domestic violence incident, university officials said.A university spokesman said the school was notified of a domestic violence incident on campus around 6 p.m. The campus was put on lockdown at 6:19 p.m. at the request of River Forest police.Officials said a woman visitor, who is not a student, was attending a symposium and seminar on campus in the 7400-block of Augusta Street when she was attacked by a man, also not a student, who she knew. The victim refused medical treatment at the scene and police said she is in a safe place following the domestic battery.A River Forest police officer saw the suspect and gave chase, but was not able to apprehend him.While a search of campus was going on, police received a 911 call reporting loud noises, which may have been gunfire, from inside a residence on campus. Police thoroughly searched that building and determined the sounds were not gunfire, and the noises were not related to the initial domestic battery incident.The lockdown was lifted after police determined the suspect was no longer on campus and there was no longer a threat the university. The lockdown was lifted just before 10 p.m.A criminal investigation is ongoing and police continue to search for the suspect.The spokesman said there was no confirmed report of a weapon on campus.