A surveillance photograph shows the suspect at the counter of the TCF Bank located inside the Jewel-Osco at 1157 N. Eola Road in Aurora.
Investigators say the suspect approached a bank teller, implied he had a weapon and demanded cash.
The suspect was able to get away with an undisclosed amount of money, according to officials.
He is described as a white male in his mid-20's, 5'9"-5'10" and weighing 160 to 170 pounds. The suspect was wearing a white and black bandana, sunglasses, a black hooded sweatshirt with a Chicago Blackhawks logo on the front, blue jeans and gym shoes, according to police.
No one was injured during the robbery.
Anyone with information is asked to call the FBI at (312) 421-6700 or Aurora Police Investigators at (630) 256-5500.