A would-be bank robber was arrested yesterday after a bystander ordered him to leave — and he did.

Police said a 50-year-old Iwilei man entered the Territorial Savings Bank in downtown Honolulu at about 9:15 a.m. and demanded money from the teller.

A witness approached the teller window and admonished the man to leave, police said.

The man left the bank without any money.

Outside, bystanders held him until officers arrived, police said.

Police arrested the man on suspicion of second-degree robbery.