Superintendent of Schools Meg Mayo-Brown said it happened around 8:15 a.m.
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Cell phone video of the incident was shared on social media.
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Harmon said no one was seriously hurt.
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“The incident is under investigation and BPS will take appropriate steps based on the outcome of the inquiry. We want our BHS community to know that we take this matter very seriously, and that the health and safety of our students remains our first and foremost priority,” Mayo-Brown said.