Authorities were unsure how a man was injured and later found early Tuesday on a Red Line train in the South Loop.
About 1:40 a.m., paramedics took the man from a Red Line train at the Harrison Street station to Northwestern Memorial Hospital, the Chicago Fire Department said. He was in serious-to-critical condition.
A CTA employee told ABC7 that the man looked bloody around the mouth, as if he was beaten.
Investigators were unsure how he was injured, Chicago police said. Witnesses on the train stated that he was already injured when they saw him, police said. The man refused to file a report with officers.
The department is not investigating the case, police said Tuesday morning.
The Chicago Transit Authority did not immediately respond to a request for comment.
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