About 7:20 p.m. Monday, the suspect approached someone on a Purple Line train at the Adams and Wabash Station in the Loop, pulled out a knife and demanded the person's phone, Chicago police said.
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After the individual gave the phone up, the suspect demand the passcode and stabbed him with the knife, according to CPD.
At 10:50 a.m. Tuesday, a 29-year-old woman told police she was on a Brown Line train in the 300-block of North Wells in the Loop when someone approached her with a knife and demanded she give him her phone and its passcode, police said.
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The suspect then fled into a nearby building and is not in custody.
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He is described as a 30- to 40-year-old man, who is 5-foot-7 to 5-foot-9-inches tall, weighing 150 to 160 pounds, CPD said.
Anyone with information is asked to call 312-745-4443 or 773-664-4880 or email Raymond.Verta@chicagopolice.org.
CTA riders are advised to be aware of their surroundings, report suspicious activity, remain calm if confronted, remember unique characteristics of any suspect and never pursue a possible suspect.