Mae Jemison High School was locked down Tuesday morning after a bomb threat was called in to the school.
The threat was called in around 9:30 a.m., according to a Huntsville City Schools spokesman. The spokesman said officials don't believe the threat is credible.
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The building was evacuated and police were called in to sweep the building.
Students were seen going back into the school around 10:30 a.m.
