Teenage boys were involved in a brawl which broke out in the interchange in Barnsley town centre.
A number of those involved in the fight at 9pm on Friday suffered minor injuries.
An investigation into the incident is now underway.
PC Beverley Frisby said: “The interchange is usually quite busy at that time on a Friday night and I’d like to ask anyone who saw what happened to contact us.
“One of the offenders is thought to have had a skateboard with him. If you saw what happened, or know who was involved, please call us."
Call South Yorkshire Police on 101.