Lewiston Police searched Jenifer Junior High School for a bomb Monday but did not find anything suspicious.
Police originally responded to the report of a burglary at McGhee Elementary School where they found evidence that led them to the junior high.
School staff and police searched Jenifer High before school started sometime after 6:00 a.m.
Students were allowed in without delay after officials swept the entire campus and found no explosive.
Anyone with information about the threat or the burglary is asked to call Lewiston Police at 208-746-0171.