Police said the teens gathered near Red Line stop at 800 North State Street, where they were reportedly fighting amongst themselves, trespassing, and refusing to listen to officers.
WATCH: More than a dozen teens arrested in downtown Chicago
Police increased patrols this weekend downtown after a similar situation Wednesday night when hundreds of teens flooded into Millennium Park.
RELATED: Police: Hundreds of teens flood downtown Chicago; 31 charged in disturbances
Thirty-one people were arrested in the first incident and are facing charges that include disorderly mob action, resisting arrest and battery.
No one was seriously injured in the disturbance, but the Chicago Police Department issued a warning ahead of summer that this behavior won't be tolerated.