CHICAGO (CBS) — Police on Tuesday were asking for help from the public in finding a man who held up two passengers at knifepoint on a Chicago Transit Authority ‘L’ train car last week.

At 5:30 p.m. Friday, police said the man was on a Green Line train at the Roosevelt Road station in the South Loop when he approached two passengers, took out a knife, and demanded an unknown amount of money.

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The suspect then fled the train for the 0-99 block of East Roosevelt Road.

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The suspect is described as a white male between 20 and 30 years old who was wearing a black Chicago White Sox beanie, a neon yellow “Staff Quick” T-shirt, and gray sleeves, blue seat pants, and black gym shoes. Police did not specify his height, weight or physical features.

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Green Line Robbery Suspect

(Credit: Chicago Police)

Green Line Robbery Suspect

(Credit: Chicago Police)

Anyone with information was asked to call the Chicago Police Mass Transit Unit at (773) 620-5873. Anonymous tips can be sent to CPDTIP.com.

CBS 2 Chicago Staff