Following violence Wednesday, there will be extra security at Petersburg High School Thursday morning.
The school is still investigating the incident, but officials posted to Facebook that tensions flared off-campus while class was in session.
The fight did not happen as part of the walkout.
A message to parents says, "We are proud of our students who organized today's thoughtful event and our students who participated. Unfortunately, in an unrelated event, some students were involved in a fight."
The students involved in the fight face disciplinary action and possible criminal charges.
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