Police said the suspect entered a TD Bank on William Floyd Parkway around 5:50 p.m. and handed over a note to the teller demanding money.
The teller complied with the orders and the man took off with an undisclosed amount of cash. He was last spotted running westbound on Surrey Circle.
The suspect is described as a white male in his late 30s to early 40s, 5'5" to 5'8" tall with a skinny build, shoulder length brown hair and a mustache. He was wearing a tan jacket, green scarf, dark ski gloves and sunglasses.
Major Case Investigations Unit detectives are investigating the case. Officials said they are hopeful that the quality of the photos will help them quickly identify the robber and help solve the crime soon.
Anyone with information regarding the incident, is urged to call Crime Stoppers at 1-800-220-TIPS. All calls will remain confidential.