In a brawl between the two teams, Los Angeles Rams star Aaron Donald repeatedly swung his helmet at his Cincinnati Bengals competitors.

The incident has forced two teams Rams and Bengals to withdraw their joint practice session early on Thursday.

Throughout fight-filled practice session players threw fists and helmets and things got uncontrollable.

Donald, an eight-time Pro Bowler and three-time AP Defensive Player of the Year, was thrown to the ground after swinging a helmet.

Because the NFL does not enforce punishment on conduct at practice, punishment would have to be imposed by the Rams and Bengals.

The Bengals and Rams, who met in the Super Bowl in February, square off in the final preseason game in Cincinnati on Saturday night.