By Mary Chappell

Chicago (CBS) — Authorities are seeking to identify a suspect in an aggravated robbery on a CTA Blue Line train near the Kedzie-Homan station Monday.

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A man was riding a Blue Line train at about 3:30 p.m. near 530 S. Kedzie Ave. when he was approached by a man who placed what the victim believed to be a gun to the back of his head and demanded his belongings.

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The offender was described as a Black man, about 25-30 years old.

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Anybody with information is asked to contact the Area One bureau of detectives at (312) 745-4443.