Evanston Police report that the TCF Bank in the Jewel supermarket at 2485 Howard St. was robbed shortly before 2 p.m. on Thursday.
Police say the robber entered the bank, announced a holdup and said he had a gun.
He fled on foot with an undermined amount of cash.
The robber is described as a thin black male, 23 to 24 years old and about 5-feet-8-inches tall. He was last seen wearing a black hooded sweatshirt, do-rag, jeans and a black jacket.