Police were called around 6:20 p.m. to the Central Mall at Jones Beach State Park.
New York State Park Police, New York State Police and Nassau County Police responded, including a Nassau County Aviation Unit.
They were able to eventually disperse the crowd.
Nassau County Police say there were about 300 young individuals on the beach.
An 18-year-old was arrested for displaying an imitation firearm to police responding to the scene.
There were four minor injuries among the group of people fighting on the beach.
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