Massive fights erupted at the Wisconsin State Fair during its chaotic closing hours Sunday, with viral video showing people in crowds throwing punches and brawling as police moved in to break up the mayhem.

Seven people were arrested in connection with the disturbance, according to Wisconsin State Fair Park. One police officer was “struck” but did not suffer serious injuries, and there were no reported serious injuries to fairgoers.

Fair officials said Wisconsin State Fair Park Police, assisted by officers from Milwaukee and West Allis, responded to disturbances “on and around” the fairgrounds near the close of the annual event on Aug. 16.

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