AURORA (AP) — The president of Aurora University in suburban Chicago says the school is offering a $25,000 reward after it evacuated campus due to a bomb threat.

The university canceled classes and employees were sent home on Wednesday. A police sweep of the campus found nothing suspicious. University President Rebecca Sherrick said in a statement that the school intends "to seek full redress for the costs and inconvenience incurred."

The university said it received three or four emails containing non-specific bomb threats. The president called the emailed threats "an act of domestic terrorism." The reward money is for information leading to the identification and apprehension of the person responsible.