Dublin schools are teaming up with the FBI's investigation into the district's third school bomb threat in the past two months.
Police were working to learn who emailed threats to several office administrators on Monday. The threats prompted a two-hour delay for the entire district.
The district's superintendent, David E. Axner, said that he did not believe a student made the threat.
Police could not say if the threat came from a group or a single person.
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