Video shows people running away from the area after someone in the crowd apparently yelled they heard gunshots.
Officers say the victims suffered minor injuries. Right now, there's no evidence shots were fired.
Lil Wayne was about five songs into his set at the annual A3C Festival when people tried to leave, police say.
Festival organizers tweeted about the incident saying there was an altercation. They said law enforcement confirmed no weapons were involved.
Lil Wayne also tweeted, saying he hoped everyone was safe.
Hope everyone at A3C is safe!! 🙏🏽— Lil Wayne WEEZY F (@LilTunechi) October 8, 2018