The Ottawa University campus was closed for about three hours Thursday morning as police investigated some suspicious packages found on the steps of an administrative building.

About 5:45 a.m., police were called to investigate a a brown, oddly shaped box with black electrical tape found on the steps of university’s Tauy Jones Hall building, according to the Franklin County Sheriff’s Office. The building was evacuated and the immediate area cleared while a bomb squad arrived to investigate.

The Bureau of Alcohol, Tobacco and Firearms, the FBI, the Ottawa Police Department, the Ottawa Fire Department, and the Franklin County Sheriff’s Office investigated, the sheriff’s office said. A campus resident had called police after discovering the package. Text and email alerts from the university announced the campus would be closed until further notice. Several other packages found nearby the Mowbray Student Union were also investigated as suspicious.

By about 9:45 a.m., investigators had opened the packages and found nothing harmful inside, said Paula Paine, an Ottawa University spokeswoman. The campus reopened about 10:15 and the university announced classes would resume at 1 p.m.

Police checked the area for any other suspicious objects and determined from interviews that there was no specific threat to the university, according to a news release from the Ottawa Police Department. Police declined to say what exactly the packages contained.

Paine said a scavenger hunt organized by students had taken place on the campus Wednesday, but investigators were not certain if it was related to the packages.