Police responded to Hartford Public High School on Tuesday afternoon for a large fight in the cafeteria.
The fight was between students, according to Hartford police.
School officials confirmed three students were involved in the fight, which happened in the cafeteria during lunchtime. It is not clear what prompted the fight.
A security guard was scratched while trying to break up the fight, police said. School officials said no injuries were reported.
The school restricted students' movements for a little over an hour while the situation was brought under control. Police responded to investigate. There was an increased security personnel for the rest of the day, and school let out 10 minutes early. There will also be extra security on site Wednesday, officials said.