Police said a student has been arrested after setting off a firework inside West Haven High School on Monday.
According to police, the incident happened right at the beginning of the day before first period. Students were in the hallway when someone threw a popper on the ground.
Authorities said the firework was small and no one was injured. A security guard was nearby when it all happened and was able to act immediately, according to police.
The West Haven Police Department and high school security arrested the student, who is 15 years old, as a result of the incident.
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Police said if the security guard wasn't present, the school would have gone into a full lockdown.
In a statement, the school district and police department said, "This is an important reminder that the West Haven Board of Education and the West Haven Police Department enforce a strict zero-tolerance policy."
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The teen is charged with first-degree breach of peace, which is a felony. The police department said everyone will be held accountable and action such as this will not be tolerated.
Monday was the first day back to school for West Haven Public Schools. No additional information was immediately available.