update:
(CNN) -- At least two people have been shot and several injured at Northern Illinois University outside Chicago, CNN affiliates are reporting.
Ambulances line up at Northern Illinois University after a shooting.
The gunman who opened fire in a lecture hall is dead, the Chicago Sun-Times is reporting.
The lecture hall is Cole Hall, reports say. The shooting occured shortly after 3 p.m. ET.
The University has ordered its student body to seek shelter and canceled classes Thursday.
"Its has been confirmed that there has been a shooting on campus and several people have been taken away by ambulance," the school said in a posting on its DeKalb campus Web site. "All classes are canceled on the DeKalb campus. People are urged not to come to campus."
DeKalb is 65 miles west of downtown Chicago and 45 minutes southeast of Rockford.