Chicago Transit Authority officials say a man found injured early Tuesday on a Red Line train in the South Loop was already injured before he boarded the train.
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.
Investigators initially 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 CTA said there is no indication the injuries occurred on or near CTA property.
"After a preliminary review of video from our security cameras, the individual in this incident entered CTA’s rail station having already suffered visible injuries," a CTA spokesperson 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.