Police say the wounded man drove himself to a hospital, where he was treated and released. Investigators talked to him and the two other men injured in the fight, but they refused to cooperate with the investigation.
Moviegoers in more than 1,000 cars rushed for the small exit when they heard the shots.
Investigators say the shooting may have been gang-related and Monday they had no suspects.
If you have any information that could help detectives, you are urged to call the Riverside Police Dept. at (951) 353-7242.
The Associated Press contributed to this report.
