Detectives say the women were armed with knives when they robbed someone at the Cermak-Chinatown Red Line Station just before 9 p.m. on Oct. 13.
The suspects are described as 18-20 years old and between 5-foot-7 and 5-foot-9.
One of the women was seen in a black sweatshirt with a Mikey Mouse logo and blue jeans.
The other woman was wearing a black jacket, black pants and black gym shoes.
Police asked anyone with information to call them at 312-745-4706.
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