Gunfire rang out at a Chicago Transit Authority Red Line station in the Uptown neighborhorhood early Wednesday morning.
A 20-year-old man at the station, on the 1100 block of West Argyle Street, was approached by someone who yelled gang slogans and fired a gun. The victim was shot in the shoulder, police News Affairs Officer Amina Greer said, citing preliminary information.
She added that the shooting appeared to be gang-related.
The man was taken to Advocate Illinois Masonic Medical Center and listed in stable condition, Greer said.
CTA spokeswoman Catherine Hosinski said there was an eight-minute delay following the shooting, but that train operations quickly returned to normal.
Area North detectives were investigating and said no arrests had been made as of 5 a.m.