Chicago police have released photographs from surveillance cameras which they say show two men suspected in the shooting Monday at the Argyle Red Line stop.
One of the two suspects flashed a handgun and fired gunshots at two men, according to police.
One man, 34, was shot and wounded in the back, buttocks, abdomen and groin. He was taken to St. Francis Hospital in Evanston, where he was listed in critical condition, according to the Chicago Tribune.
The second man declined treatment for a grave wound, police said.
The shooting took place at about 4 p.m. Monday.
Anyone with information as to the identity of the two men shown in the photos is encouraged to call Area North detectives at (312) 744-8261.