Around 10 this morning, Janesville Police were called to the US Bank at 2732 Milton Avenue.
Police say a white male wearing a black hat, black coat and gray scarf demanded money from a clerk, threatening a firearm.
The robber was handed an unknown amount of cash before fleeing the scene on foot.
Police need your help finding him. If you have any information about this crime, you're encouraged to call the Janesville PD or Crimestoppers.