CHICAGO (CBS)– A suspect has been charged with shooting a man on a CTA Blue Line train.

Anothony Guglielmi, CPD spokesperson, said Patrick Waldon, 31, was arrested Wednesday and has prior convictions for battery, armed robbery, gun possession and was on parole at the time of the incident.

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Interim Police Supt. Charlie Beck addressed the media Thursday and said video throughout the city was used to track Waldon.

Officials said Waldon was spotted at a Target throwing away some of the victim’s items he stole. He was later located, still armed.

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According to Chicago police, Waldon is charged with aggravated battery, armed robbery and being an armed habitual criminal.

Waldon is due in court Thursday afternoon.

A man was shot on a Blue Line train at the UIC-Halsted stop Wednesday morning, in an apparent robbery following an argument on the train, police said.

Police Chief of Patrol Fred Waller said a 30-year-old man was shot in the back around 10:45 a.m. as he was exiting a westbound Blue Line train at the UIC-Halsted station at 430 S. Halsted St.

The victim was taken to Stroger Hospital in “very serious condition,” according to Waller. He was interviewed police after undergoing surgery, officials said Thursday.

Beck said he is meeting with CTA officials to talk about increasing police presence.

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This is a developing story.