Investigators said a male suspect stabbed a 22-year-old woman in the face, then assaulted another 20-year-old woman on the CTA Cermak-Chinatown platform around 10:30 a.m.
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The 20-year-old woman was able to avoid the stabbing, but the suspect punched her in the face with his fist, police said.
The 22-year-old woman sought treatment at Northwestern Memorial Hospital. No information was immediately available on her condition.
The same man later swung a construction cone at a woman at the Roosevelt stop, police said.