Police are looking for a man who robbed a Bank of America near Roosevelt and Lake Shore boulevards on Monday morning.
No one was hurt, but the robber escaped on foot.
Police said the man is 6 feet 1 inch tall, thin and between 35 and 40 years old. He was wearing a long tan jacket with a hoodie beneath it, and a green hat with a tan bill.
The teller did not see a gun but said the man implied he had one. He used a note demanding money that he took with him when he left, police said.
Anyone with any information about the robbery is asked to call Crime Stoppers at 866-845-TIPS.