After alerting everyone to stay inside after reports of a gunman, Princeton University's Department of Public Safety has issued an all clear.
CBS station KYW reports that person is now in custody and that he had a toy pistol.
The university's Web site reports "community members should resume normal activities."
Earlier, the Web site said a male with what appeared to be a handgun was reported near Dod Hall dormitory around 11 a.m. (1500 GMT) Wednesday.
It's not clear how many students remain on campus. Commencement was Tuesday.