The woman was standing in the street just after 3:10 a.m. in the 9500-block of South State Street, near the 95th Street CTA Red Line station, when a male suspect approached her with a knife, Chicago police said.
She was taken to Advocate Christ Medical Center in Oak Lawn in good condition, with lacerations to her ears, according to law enforcement officials.
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Caution tape could still be seen outside the Red Line station, just before 6 a.m. Friday.
No one was in custody later Friday, and Area Two detectives are investigating the incident.