Bomb Threat Forces Evacuation: Students and University personnel were evacuated from the Frieze Building on the University campus yesterday after an anonymous caller reported a bomb was set to go off in the building at 1:30 p.m. The "tip" was telephoned into the Sheriff's Department, which then contacted city police. Officers conducted a search of the building's rooms and hallways, but no bomb was found. The case has been turned over to the Federal Bureau of Investigation, bomb threats being a federal offense. Students here wait in the rain at a Washington St. entrance to the building. Classes resumed at 2 p.m. after the search was completed. University security men also aided in the search.