For the third straight day, a threatening note was found inside a Highland Park High School boys bathroom, officials say.
On Thursday, the school dismissed students early and canceled a volleyball banquet that evening after threatening notes were found in the same bathroom on two consecutive days. But school officials did not dismiss early or cancel any events on Friday.
School officials said students were dismissed as a precaution Thursday and that the campus was searched by both human and K9 officers.
Nothing was found during Thursday's sweep of the school. The volleyball banquet was canceled because the security sweep was not finished.
Specifics regarding the threat have not been revealed, though officials said Thursday they do not believe there is an imminent threat.
University Park police are investigating. Police said they may contact the Bureau of Alcohol, Tobacco, Firearms and Explosives to assist with the investigation.
Police said they would pursue a felony charge against the person responsible.
NBC 5's Randy McIlwain contributed to this report.