(Portland, OR)  --  Police are looking for a suspect who robbed a Wells Fargo bank in downtown Portland.  Authorities say a man entered the bank on Southwest 5th Avenue around 12:17 yesterday afternoon, gave an employee a note demanding money, and left with an unknown amount of cash.  Police describe the robber as a white man in his 30s, standing nearly six feet tall, last seen wearing sunglasses and black pants.  Anyone with helpful information is asked to call the Police Bureau at 503-224-4181.