A Chicago bank security guard was shot Thursday while confronting a suspected robber, authorities said. 

The suspected thief entered a Fifth Third Bank before 3 p.m. at 1 S. Wacker Drive in the downtown area, the FBI said. 

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A bank security guard in Chicago was shot Thursday by a suspected robber as the offender was fleeing the scene, police said.  (WFLD)

At some point, the 59-year-old security guard confronted the suspect, who opened fire with a handgun and shot the victim, the Chicago Police Department said. 

He sustained a graze wound to the right hand and declined medical attention, police said. The guard was able to fire his weapon at the suspect. 

An image of a suspect bank robbery who shot a security guard Thursday.  (FBI)

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It was not clear if the suspect was struck by gunfire. No other injuries were reported. The FBI is investigating the robbery. 

The agency described the suspect as a Black male who is 5 feet, 7 inches tall and wearing a black hooded jacket, a mask, winter gloves, and blue jeans.