The Winnipeg Police Service said it could not determine if a man armed with a knife was on the University of Manitoba campus Tuesday.

Reports were made Tuesday that a man armed with a large knife was seen in a campus building

The incident prompted a significant police response, with classes canceled and emergency alerts sent through the province’s Alert Ready emergency alert system.

“Investigators explored multiple sources of evidence; however, we were unable to substantiate the information that was presented,” police said in a statement Thursday.

Officers added that they believe their course of action was timely and appropriate based on the initial report and details provided.

The incident remains under investigation and anyone with information or video surveillance is asked to contact police.