McMaster University in Hamilton has closed one of its buildings after receiving a threat.

Hamilton police were called around 9 a.m. Friday after a threat was directed at a building on campus. McMaster says it was the Institute for Applied Health Sciences and classes were cancelled for the day.

“Students, faculty and staff have been cleared and sent home for the day,” the university said in a statement on its website.

Officers searched the building with school staff and the investigation continues.