Officers responded to the scene, a Key Bank branch in the 9700 block of Holman Road NW, at about 12:45 p.m. after recieving a report of a bank robbery, said Detective Jeff Kappel of the Seattle police.
By the time officers arrived, the suspect was gone.
A preliminary investigation found that the man entered the bank, implied that he had a gun - but did not display one - and produced a note demanding money.
The suspect left with an undisclosed amount of cash and remains at large. Nobody was injured during the robbery.
The suspect is described as a thin white man in his late 50s or 60s, standing about six feet tall, clean-shaven with gray hair. He was last seen wearing aviator sunglasses, a red-black-and-white driving cap, a dark navy blue jacket with a white-collared shirt underneath.
Anyone with information or who may know the identity or whereabouts of the suspect is asked to call 911 or Seattle police. Anonymous tips are welcome.
The investigation continues, Kappel said.