CHICAGO — A CTA employee was stabbed while being used as a human shield early Friday at the Roosevelt Station, police said.

At 2 a.m. Friday, the employee, a 38-year-old man, was on a platform at the station near the 1100 block of South State Street when he saw two men and a woman chasing another man, police said. The man who was being chased ran behind the CTA employee.

The employee got into an “altercation” with a man, police said, and the man stabbed the employee in his chest and abdomen.

The men and woman ran away. The employee was taken to Northwestern Hospital, where his condition was not available but he was listed as “stable,” police said.

No one was in custody. An investigation was ongoing.