UPDATE (WKOW) -- Authorities have lifted the lockdown of a building on Northwestern University's Chicago campus.
The school issued an alert earlier Wednesday for people in the Rubloff Building to stay in offices with the doors locked, after reports of a possible gunman inside an 11th floor elevator.
A notice on the university's Web site says police completed a more than two-hour search of the building. It adds that they remain on the scene and continue to investigate.
Northwestern spokeswoman Pat Tremmel declined to provide other details, including whether there were any arrests.
The Rubloff Building houses a number of research and law school offices.
CHICAGO, IL (WKOW) -- Police are searching a building at Northwestern University's campus in downtown Chicago after receiving a report that a man inside may have a gun.
An alert posted on the school's Web site tells those in the Rubloff Building to stay in their offices with the doors locked, while campus and Chicago police conduct the search. The alert says someone reported seeing a man with a gun in his waistband inside an 11th floor elevator.
A campus police dispatcher would only say officers are following up on the report. He declined to provide other details. A Chicago police spokesman referred all questions to Northwestern.