Watch: Brawl in Sydney CBD

Three men have been arrested after a violent brawl in Sydney's CBD.

Police said one man was taken to hospital with minor injuries after a fight broke out between two groups of people on George St just before midnight last night.

It is understood the injured man suffered serious lacerations during the fight.

The brawl, which involved about 30 people, followed a dispute between two men, The Daily Telegraph reported.

The arrested men were assisting police with their inquiries.

No charges have yet been laid.

In footage supplied to Channel 9, the group can be seen punching and kicking each other as several people look on.

One scene shows a man being thrown to the ground while another throws punches at him.

Witness Lachie Cumming told Channel Nine there was a lot of shouting and yelling and that you could hear glasses smashing.

"[There were] a few blokes throwing punches, throwing glasses," he said.

"All you kind of heard was glass shattering and punches being thrown."

- AAP