Man stabbed during argument on CTA Red Line in South Loop

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CHICAGO -- A man was stabbed and critically wounded during an argument on a Red Line train in the South Loop overnight.

Police say the 36-year-old man was on the train around 10 p.m. Wednesday at the Roosevelt station, when he got into an argument with another man who pulled out a knife and stabbed him.

The man suffered wounds to the left arm and chest and was transported to Northwestern Memorial Hospital in critical condition.

The suspect has not been caught. Police say both men are homeless.

The Chicago Tribune contributed