CHICAGO - One man was killed and another was wounded after an argument escalated into a shooting aboard a CTA Pink Line train early Tuesday in downtown Chicago, according to police. Officers responded around 1:22 a.m. to reports of a shooting on a CTA Pink Line train near Wells and Washington streets in the Loop.

A yearly tradition will make its return this week as Chicago-area residents can get free transit rides on New Year’s Eve.

According to the Chicago Police Department, a 44-year-old man was killed in a shooting just before 1:30 a.m. in the 100 block of North Wells.

Police are investigating a shooting on a CTA Pink Line train in The Loop early Tuesday morning. Video from the scene showed Chicago police canvassing the area around Wells and Randolph streets around 1:30 a.m. Police were investigating inside a train car. The circumstances surrounding the shooting have not been released.

A federal grand jury in Chicago has indicted a man on terrorism and arson charges for allegedly lighting a passenger on fire on a Chicago Transit Authority train and setting fire to Chicago City Hall three days earlier.