Earlier today school officials delayed the opening of all city schools for two hours to conduct a sweep of the buildings.

Officials notified parents at about 7:15 this morning that schools would be delayed for an unspecified reason.

Police say the schools received the threat this morning but offered no other details.

Earlier this fall, Dublin Coffman and Dublin Jerome high schools were evacuated because of bomb threats.  A Jerome student was later charged in connection the threat at that school.

No bombs were found.