A bomb threat Tuesday morning targeting a building at the University of St. Thomas prompted an evacuation before an all clear was issued about 75 minutes later, officials at the school in St. Paul said.

The school’s Twitter account reported the threat sometime after 9:30 a.m. targeting the John R. Roach Center for the Liberal Arts on the northwest corner of Summit and Cleveland avenues.

Following the evacuation, personnel secured the building and began a search.

“No suspicious objects were found,” a statement from the school read.

The all clear was issued about 10:45 a.m., but the school also said the building would remain closed for the day. Classes were moved elsewhere.