A threat found written inside a Green Bay high school forced four schools to secure their buildings Tuesday afternoon.
The threat was found inside Southwest High School, the school district said.
Southwest, Lombardi Middle School, King Elementary School and MacArthur Elementary School all had to secure their buildings during the incident, meaning no one was allowed in or out.
School officials were able to identify the person who made the threat, police said. Investigators then found it was not a valid threat and school resumed.
School will go on as normal Wednesday.
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