CHICAGO (WLS) -- Chicago police are searching for the suspect wanted in the robbery and attack of a pregnant woman at CTA station in the Loop.

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The crime happened on October 4 at about 12:40 p.m. in the tunnel between the CTA Red Line and Blue Line at Jackson, police said.

Police said the suspect approached a pregnant woman from behind, grabbed her purse and aggressively threw her to the ground and into the wall.

The suspect allegedly fled on a bicycle.

Anyone with information is urged to contact Chicago police.

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