The victim exited the station and notified authorities, police say.
The wanted offender is described as a black male, age 20-30, 5 ft. 6 inches, 180 lbs. with black hair worn in braids, brown eyes, and a light complexion.
Suspect sought after abuse on Blue Line
September 8, 2010 (CHICAGO) According to authorities, on August 27, 2010 at approximately 2 a.m., a 19-year-old female who was riding the CTA Blue line, exited at LaSalle and was followed by a black male who touched her from behind as she rode the escalator. Police say when the victim turned to address the offender, he put his head down toward her lap area.
