Northwestern University reports person with gun on campus

EVANSTON, Ill. — Authorities are urging people at Northwestern University in suburban Chicago to take shelter after a report of a gunman and shots fired in a student residential building.In a Twitter post Wednesday afternoon, Evanston police say there was a report of a gun and "shots fired" but that officers had not found "evidence of a victim, scene or gunman."University spokesman Jon Yates says the report comes from Engelhart Hall, a graduate student dormitory. But he says the university