The National Basketball Association has suspended Indiana's Jermaine O'Neal, Stephen Jackson, Ron Artest and Detroit's Ben Wallace for brawling.
Following one of the ugliest incidents in United States sports history, the league has handed the four players indefinite suspensions.
The brawl started when Artest was ruled to have fouled Ben Wallace, who hit back with a shove in Artest's face.
The NBA also intends to reviewing its rules and security procedures.
Commissioner David Stern called Friday's scenes "shocking, repulsive and inexcusable - a humiliation for everyone associated with the NBA".
In a statement, Stern added: "Our investigation is ongoing, and I expect it to be completed by Sunday."
The bans for Artest, O'Neal and Jackson, all of whom threw punches at fans during the fight at the end of the Pacers-Pistons game - start on Saturday, when the Pacers played a home game against Orlando.
Wallace's suspension will begin with the Pistons' next home game on Sunday against the Charlotte Bobcats.
Pistons spokesman Tom Wilson said the team plans to double the number of armed police and increase arena security by about 25% for Sunday's game.
The brawl has stunned US sport. Artest and Jackson bolted into the stands near centre court and threw punches at fans after debris was thrown at the players.
Later, fans who came onto the court were punched in the face by Artest and