Surveillance photos of the robbery show a man walked into the Citibank at 2801 West Devon Avenue around 12:15 p.m. Saturday, demanded money and ran away with an undisclosed amount of cash.
Police said the suspect did not show a weapon. No one was hurt.
The FBI said the suspect is an African American man in his mid-30s. He is about 6 feet tall and weighs around 185 pounds with a medium build. He is bald and has tattoos on both forearms. He was wearing a gray shirt and blue jeans at the time of the robbery.
Anyone with information regarding the robbery should call the FBI at (312) 421-6700.
The Sun-Times Media Wire contributed to this report.