Hilburn Academy was temporarily under a code red lockdown on Tuesday afternoon.
A message was posted to the academy's website, reading "Our school is under Code Red. Students are safe. Check your email and the school website for updates."
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Later, the message was updated to state "Our school is now in Code Green. Students are safe and will remain in classrooms for a controlled dismissal."
The circumstances around what prompted the lockdown are not known.
This is a developing story.