CTA said just after 5:20 a.m., Chicago police and fire officials responded to the North and Clybourn station after reports of a disturbance onboard a southbound Red Line train.
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Chicago fire officials said one person was taken to Illinois Masonic hospital in serious condition.
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CPD said a male suspect had approached the man and grabbed his property; the suspect then stabbed the man in the abdomen and thigh.
The suspect was quickly located and taken into custody, police said.
Charges are pending.
Service along the Red Line was briefly impacted, but has since resumed.
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