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Several calls went out to parents before 6 a.m. alerting them to a possible bomb threat.
Police investigating possible threat at Holly Springs High School
Police and K9 units swept the school's campus for several hours before giving the "all clear."
Officers said they were unable to find a credible threat.
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Buses were released to pick up students around 7:45 a.m.; however, school officials said elementary students would be picked up first.