Brown, who has a history of drug and alcohol arrests, was apparently not involved, authorities said. He lives outside Atlanta with his wife, singer Whitney Houston.
Brown was with a group of people celebrating a relative's birthday at Justin's Restaurant and Bar when a fight broke out, and two members of Brown's group were either cut or stabbed, police detective D.L. Dixon said.
"There was a lot of music and talking going on," Dixon said. "It could have been something as simple as a bump, you know, somebody bumped into each other."
Justin's Restaurant and Bar is owned by rapper and producer Sean "P. Diddy" Combs.
Authorities were looking for the suspects, who drove away after the fight. The cause of the altercation was not immediately known.
A 21-year-old man was taken to Piedmont Hospital and a 20-year-old man was taken to Atlanta Medical Center. Both were in stable condition, Dixon said.