Officers responded at about 11 p.m. Thursday after receiving a report of a shooting in the 14300 block of Aurora Avenue North.
A preliminary investigation found a man was shot at least once in the chest in the parking lot behind the Hertz car rental building. The shooter then fled the scene on a bicycle, said Detective Jeff Kappel of the Seattle police.
Further investigation revealed that the shooter and victim are known to each other. The events leading up to the shooting are unknown.
The victim, a man believed to be in his 30s, was taken to Harborview Medical Center for treatment of his life-threatening injuries, Kappel said.
The shooter is described as a black man in his late 30s with a thin build. He was last seen wearing blue jeans and riding a bicycle south on Aurora Avenue, away from the scene.
Detectives are continuing to actively investigate the shooting.
Anyone with information is asked to call 911 or the Seattle Police Homicide Tip Line at 206-233-5000. Anonymous tips are welcome.