( CNN ) -- Four buildings on The Ohio State University campus were evacuated Tuesday after the FBI 's Columbus , Ohio , bureau notified the university it had received an anonymous message that explosives were placed in the buildings , authorities said . The buildings are the William Oxley Thompson Memorial Library , the McPherson Chemical Lab , Smith Laboratory and Scott Laboratory . Classes in the three academic buildings involved were canceled , and all four buildings were closed until at least 5 p.m. or until the investigation is complete , according to Vernon Baisden , the university 's director of public safety . Officials did not say whether any explosives had been found in the buildings . The university was notified of the threat at 8:19 a.m. and activated its Buckeye Alert System at 8:41 a.m. , according to a message posted on the Ohio State website . Nearby streets were closed to vehicle traffic , university Police Chief Paul Denton told reporters . Local , state and federal authorities were assisting in the investigation , Baisden said , but he said officials could release few details about specifics . Aerial footage showed authorities with dogs entering one of the buildings . Students and employees `` responded in an orderly fashion , '' Baisden said , `` and we have no reports of any real confusion , other than the fact that everybody was wondering what was going on . '' Asked whether the threat was targeting labs , Baisden noted that labs are located in many locations on the Ohio State campus .
The buildings will remain closed until at least 5 p.m. , officials say . The FBI notified university officials of the threat . Comment: