Police say that gunfire erupted at the Shinnecock Indian Powow Saturday night.
State police say troopers heard gunshots around 8 p.m. at the tribe's reservation near Southampton.
Troopers say they found a Mastic man fighting with another attendee nearby.
They say the 23-year-old fired a shot, another man grabbed the gun and another shot was fired as they fought.
The second man took the gun and ran off.
The 23-year-old was charged with weapon possession.