One person was injured in an early-morning shooting Sunday at the Potawatomi Bingo Casino, Milwaukee police said.

Sgt. Mark Stanmeyer said the 23-year-old Milwaukee woman was shot in the leg at about 1:30 a.m. Sunday during a fight inside the casino. Her injuries were not life-threatening. Police told WISN Channel 2 that the woman and her boyfriend got into an argument and he shot her.

A 27-year-old Wauwatosa man from arrested at the scene, Stanmeyer said. He was not immediately charged.

Police did not disclose either person's name.

The casino said in a statement that it closed temporarily after the shooting, but reopened at 9 a.m. Sunday. The statement called the shooting an "extremely isolated event."

Cheryl Anderson of Milwaukee told The Associated Press she was at the slot machines when she heard a shot, which she said was fired at the nearby table games, followed by more shots.

"We all of a sudden heard a bang," Anderson said. "... It was a shooting, you could tell. It was so loud like a cannonball. We hit the floor, everybody was panicking. We just stayed there because we didn't know what the heck to do. We saw a guard running, everybody running."

Stanmeyer said the case will be referred to the Milwaukee County District Attorney's Office in the coming days for possible charges.

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Copyright 2013 The Associated Press.