Judson University said in a tweet about 8:45 a.m. that Elgin police were looking into the threat, and all classes and chapel until 5 p.m. were canceled.
The campus was also closed to guests and visitors, the school said.
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About an hour earlier, the university had tweeted that they were aware of a "non-specific threat to campus," and Elgin police were present.
Just before 9:15 a.m., the school said an all clear had been given after police searched all university buildings.
The evangelical Christian school is located on 1151 N. State St. in Elgin.